Parlot The flags for the compiler The default flags: Invocation lambda is inlined, no debug info Prevents the inlining of the lambda in the Invocation expression to optimize for the multiple same lambda compiled once Adds the Expression, ExpressionString, and CSharpString to the delegate closure for the debugging inspection When the flag is set then instead of the returning `null` the specific exception is thrown*346 FEC Not Supported exception The reason Constructor Constructor The interface is implemented by the compiled delegate Target if `CompilerFlags.EnableDelegateDebugInfo` is set. The lambda expression object that was compiled to the delegate The lambda expression construction syntax C# code The equivalent C# code of the lambda expression Compiles expression to delegate ~20 times faster than Expression.Compile. Partial to extend with your things when used as source file. Compiles lambda expression to TDelegate type. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles a static method to the passed IL Generator. Could be used as alternative for `CompileToMethod` like this . Check `IssueTests.Issue179_Add_something_like_LambdaExpression_CompileToMethod.cs` for example. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Unifies Compile for System.Linq.Expressions and FEC.LightExpression Unifies Compile for System.Linq.Expressions and FEC.LightExpression Compiles lambda expression to TDelegate type. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to TDelegate type. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to TDelegate type. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Compiles lambda expression to delegate. Use ifFastFailedReturnNull parameter to Not fallback to Expression.Compile, useful for testing. Tries to compile lambda expression to Tries to compile lambda expression to with the provided closure object and constant expressions (or lack there of) - Constant expression should be the in order of Fields in closure object! Note 1: Use it on your own risk - FEC won't verify the expression is compile-able with passed closure, it is up to you! Note 2: The expression with NESTED LAMBDA IS NOT SUPPORTED! Note 3: `Label` and `GoTo` are not supported in this case, because they need first round to collect out-of-order labels Tries to compile lambda expression to with the provided closure object and constant expressions (or lack there of) Tries to compile expression to "static" delegate, skipping the step of collecting the closure object. Collects the lambda info for the compilation Compiled lambda The nested lambdas and their info The lambda expression Parameters not passed through lambda parameter list But used inside lambda body. The top expression should Not contain not passed parameters. Index of the compiled lambda in the parent lambda closure array Index of the variable which store the non-passed variables array before passing it to the closure constructor. It used to assign the closed variables from the outside of the nested lambda Returns the type of lambda Compares 2 lambda expressions for equality Track the info required to build a closure object + some context information not directly related to closure. Tracks that the last emit was an address Tracks the use of the variables in the blocks stack per variable, (uint) contains (ushort) BlockIndex in the upper bits and (ushort) VarIndex in the lower bits. to determine if variable is the local variable and in what block it's defined The map of inlined invocations collected in TryCollect and then used in TryEmit New or Call expressions containing the complex expression, e.g. inlined Lambda Invoke or Try with Finally The stack for the lambda invocation and the labels bound to them This is required because we have the return from the nested lambda expression, and when inlined in the parent lambda it is no longer the return but just a jump to the label. Constant expressions to find an index (by reference) of constant expression from compiled expression. Constant usage count and variable index. It is a separate collection from the Constants because we directly convert later into the closure array Parameters not passed through lambda parameter list But used inside lambda body. The top expression should Not contain not passed parameters. The nested lambdas and their info Populates the info Populates info directly with provided closure object and constants. Local variable index is not known in the collecting phase when we only need to decide if ParameterExpression is an actual parameter or variable Helps to identify constants as the one to be put into the Closure Multi-dimensional array initializer is not supported Quote is not supported Dynamic is not supported RuntimeVariables is not supported MemberInit MemberBinding is not supported MemberInit ListBinding is not supported Goto of the Return kind from the TryCatch is not supported Not supported assignment target TypeEqual is not supported `when` in catch is not supported yet Wraps the call to `TryCollectInfo` for the compatibility and provide the root place to check the returned error code. Imprtant: The method collects the info from the nested lambdas up-front and de-duplicates the lambdas as well. Collects the information about closure constants, nested lambdas, non-passed parameters, goto labels and variables in blocks. Returns `OK` result if everything is fine and other result for error. Return IDelegateDebugInfo if the delegate is fast compiled with `CompilerFlags.EnableDelegateDebugInfo` flag The minimal context-aware flags set by parent Default is no flags The result of expression is ignored and maybe popped out Some parent is the call expression Any Parent Expression is a MemberExpression Some arithmetic operation Subject Expression with instance object (method call or member access or array access) Subject Subject Combination`of InstanceAccess and Call Constructor Constructor call Indexer Invoking the inlined lambda (the default System.Expression behavior) Indicate if the part AT LEAST participates in the assignment on the left side, it may also participate in the right side, e.g. ++x.Bar Indicates the ONLY right value of assignment, e.g. `p` in `foo.Bar += p` Assigning the ref of the right value to the left, e.g. in `var a = ref b[1]` we are passing this flag for the `ref b[1]` Supports emitting of selected expressions, e.g. lambdaExpr are not supported yet. When emitter find not supported expression it will return false from , so I could fallback to normal and slow Expression.Compile. Get the advantage of the optimized specialized EmitCall method Same as EmitMethodCall which checks the method for null first, and returns false if it is null. Same as EmitMethodCallOrVirtualCall which checks the method for null first, and returns false if it is null. Efficiently emit the int constant Reflecting the internal methods to access the more performant for defining the local variable Efficiently returns the next variable index, hopefully without unnecessary allocations. Prints the expression in its constructing syntax - helpful to get the expression from the debug session and put into it the code for the test. Prints the expression in its constructing syntax - helpful to get the expression from the debug session and put into it the code for the test. In addition, returns the gathered expressions, parameters ad labels. Converts the expression into the valid C# code representation Tries hard to convert the expression into the valid C# code Tries hard to convert the expression into the valid C# code Tries hard to convert the expression into the valid C# code Indicates the expression container Prefers the parens by default The test part of the If expression The `if (test)` part The lambda Return expression Instructs the client code to avoid parenthesis for the generated C# code, e.g. if we have as single argument in a method The instance when calling the instance method or accessing the instance member Converts the into the proper C# representation. Prints valid C# Boolean Prints valid C# String escaping the things Prints valid C# Enum literal Custom handler for output the object in valid C#. Note, the `printGenericTypeArgs` is excluded because it cannot be a open-generic object. This handler is also used to allow user to fully control a Constant expression output Outputs the `default(Type)` for the unknown constant with the comment message Prints many code items as the array initializer. Prints many code items as array initializer. Prints a valid C# for known , otherwise uses passed or falls back to `ToString()`. Helper method to find the number of lambdas in the C# `code` string Wrapper for the array and count Array of items The count of used items Creating this stuff Creates the wrapper out of the items Popping candy SmallList module he-he Appends the new default item at the end of the items. Assumes that `index lte items.Length`! `items` should be not null Appends the new default item at the end of the items. Assumes that `index lte items.Length`, `items` may be null Returns surely present item ref by its index Appends the new default item to the list and returns ref to it for write or read Appends the new item to the list Looks for the item in the list and return its index if found or -1 for the absent item Returns the ref of the found item or appends the item to the end of the list, and returns ref to it Returns surely present item ref by its index Returns last present item ref, assumes that the list is not empty! Returns the ref to tombstone indicating the missing item. Appends the default item to the end of the list and returns the reference to it. Looks for the item in the list and return its index if found or -1 for the absent item Returns the ref of the found item or appends the item to the end of the list, and returns ref to it Returns surely present item ref by its index Returns last present item ref, assumes that the list is not empty! Returns the ref to tombstone indicating the missing item. Appends the default item to the end of the list and returns the reference to it. Looks for the item in the list and return its index if found or -1 for the absent item Returns the ref of the found item or appends the item to the end of the list, and returns ref to it List with the number of first items (4) stored inside its struct and the rest in the growable array. Supports addition and removal (removel is without resize) only at the end of the list, aka Stack behavior The number of entries stored inside the map itself without moving them to array on heap Gets the number of items in the list Returns surely present item by its index Adds the item to the end of the list aka the Stack.Push Bridge to go from the List.Add Adds the default item to the end of the list aka the Stack.Push default Removes the last item from the list aka the Stack Pop. Assumes that the list is not empty! Copy items to new the array Exposing as list List with the number of first items (2) stored inside its struct and the rest in the growable array. Supports addition and removal (removel is without resize) only at the end of the list, aka Stack behavior The number of entries stored inside the map itself without moving them to array on heap Good stuff Good stiff Good steff Good staff Good styff Good staff Gets the number of items in the list Returns surely present item by its index Adds the item to the end of the list aka the Stack.Push Sugar bridge from the List.Add Adds the default item to the end of the list aka the Stack.Push default Removes the last item from the list aka the Stack Pop. Assumes that the list is not empty! Copy items to new the array Exposing as list Configiration and the tools for the FHashMap map data structure Upper hash bits spent on storing the probes, e.g. 5 bits mean 31 probes max. The number of entries stored inside the map itself without moving them to array on heap Creates the map with the storage Holds a single entry consisting of key and value. Value may be set or changed but the key is set in stone (by construction). The readonly key The mutable value Construct with the key and default value Construct with the key and value binary reprsentation of the `int` Configures removed key tombstone, equality and hash function for the FHashMap Defines the value of the key indicating the removed entry Equals keys Calculates and returns the hash of the key Default comparer using the `object.GetHashCode` and `object.Equals` oveloads Uses the `object.GetHashCode` and `object.ReferenceEquals` Compares via `ReferenceEquals` and gets the hash faster via `RuntimeHelpers.GetHashCode` Compares via `ReferenceEquals` and gets the hash faster via `RuntimeHelpers.GetHashCode` Combines the hashes of 2 keys Combines the hashes of 2 keys Abstraction to configure your own entries data structure. Check the derivitives for the examples Initializes the entries storage to the specified capacity via the number of bits in the capacity Returns the reference to entry by its index, index should map to the present/non-removed entry Adds the key at the "end" of entriesc- so the order of addition is preserved. For now to use in the Set as a value Stores the entries in a single dynamically reallocated array Finds the stored value by key. If found returns ref to the value it can be modified in place. Finds the stored value by key. If found returns ref to the value it can be modified in place. Gets the reference to the existing value of the provided key, or the default value to set for the newly added key. Adds the sure absent key entry. Provides the performance in scenarios where you look for present key, and using it, and if ABSENT then add the new one. So this method optimized NOT to look for the present item for the second time in SEQUENCE Get the value ref by the entry index. Also the index corresponds to entry adding order. Improtant: it does not checks the index bounds, so you need to check that the index is from 0 to map.Count-1 Fast and less-allocating hash map without thread safety nets. Please measure it in your own use case before use. It is configurable in regard of hash calculation/equality via `TEq` type paremeter and in regard of key-value storage via `TEntries` type parameter. Details: - Implemented as a struct so that the empty/default map does not allocate on heap - Hashes and key-values are the separate collections enabling better cash locality and faster performance (data-oriented design) - No SIMD for now to avoid complexity and costs for the smaller maps, so the map is more fit for the smaller sizes. - Provides the "stable" enumeration of the entries in the added order - The TryRemove method removes the hash but replaces the key-value entry with the tombstone key and the default value. For instance, for the `RefEq` the tombstone is . You may redefine it in the `IEq{K}.GetTombstone()` implementation. Capacity bits Access to the hashes and indexes Number of entries in the map Access to the key-value entries Capacity calculates as `1 leftShift capacityBitShift` Cache of char to string mapping to reduce allocations when doing chars comparisons. Reprensents the context of a compilation phase, coordinating all the parsers involved. Gets the expression containing the the instance for the parser. Gets or sets a counter used to generate unique variable names. Gets the list of global variables to add the the final list of statements. Gets the list of global expressions to add the the final list of statements. Gets the list of shared lambda expressions representing intermediate parsers. This is used for debug only, in order to inspect the source generated for these intermediate parsers. Gets or sets whether the current compilation phase should ignore the results of the parsers. When set to false, the compiled statements don't need to record and define the property. This is done to optimize compiled parser that are usually used for pattern matching only. Every parser that is compiled returns an instance of which encapsulates the statements to execute in order to parse the expected input. The convention is that these statements are returned in the property, and any variable that needs to be declared in the block that the is used in are set in the list. The property reprsents the variable that contains the success of the statements once executed, and if true then the property contains the result. Gets the list of representing the variables used by the compiled result. Gets the list of representing the body of the compiled results. Gets or sets the of the variable representing the success of the parsing statements. Gets or sets the of the variable representing the value of the parsing statements. Marker interface to detect a Parser has already been compiled. An instance of this class encapsulates the result of a compiled parser in order to expose is as as standard parser contract. This class is used in . Creates a compiled representation of a parser. The current compilation context. Advances the cursor by one character. Advances the cursor. Advances the cursor with the knowledge there are no new lines. Moves the cursor to the specific position Evaluates the char at the current position. Returns the cursor's position in the _buffer. Evaluates a char forward in the _buffer. Whether a char is at the current position. Whether a string is at the current position. Whether a string is at the current position. Doesn't parse anything and return the default value. Doesn't parse anything and return the default value. Returns a default value if the previous parser failed. Successful when the cursor is at the end of the string. OneOf the inner choices when all parsers return the same type. We then return the actual result of each parser. The number of usages of the parser before it is compiled automatically. 0 to disable automatic compilation. Default is 0. Whether new lines are treated as normal chars or white spaces. Default is false. When false, new lines will be skipped like any other white space. Otherwise new lines need to be read explicitely by a rule. The scanner used for the parsing session. Delegate that is executed whenever a parser is invoked. The parser that is used to parse whitespaces and comments. Called whenever a parser is invoked. Will be used to detect invalid states and infinite loops. Compiles the current parser. A compiled parser. Invokes the method of the if it's available or creates a generic one. The instance. Forces the instruction to compute the resulting value whatever the state of is. Builds a parser that converts the previous result when it succeeds. Builds a parser that converts the previous result, and can alter the current . Builds a parser that converts the previous result. Builds a parser that converts the previous result when it succeeds or returns a default value if it fails. Builds a parser that converts the previous result or returns a default value if it fails, and can alter the current . Builds a parser that converts the previous result or returns a default value if it fails. Builds a parser that emits an error when the previous parser failed. Builds a parser that emits an error. Builds a parser that emits an error. Builds a parser that verifies the previous parser result matches a predicate. Builds a parser what returns another one based on the previous result. Builds a parser that ensures the cursor is at the end of the input. Builds a parser that discards the previous result and replaces it by the specified type or value. Builds a parser that discards the previous result and replaces it by the specified type or value. Builds a parser that returns a default value if the previous parser fails. Builds a parser that ensure the specified parsers match consecutively. Builds a parser that ensure the specified parsers match consecutively. Builds a parser that ensure the specified parsers match consecutively. Builds a parser that ensure the specified parsers match consecutively. Builds a parser that ensure the specified parsers match consecutively. Builds a parser that ensure the specified parsers match consecutively. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Provides parsers for literals. Literals do not skip spaces before being parsed and can be combined to parse composite terms. Provides parsers for terms. Terms skip spaces before being parsed. Builds a parser that looks for zero or many times a parser separated by another one. Builds a parser that skips white spaces before another one. Builds a parser that looks for zero or one time the specified parser. Builds a parser that looks for zero or many times the specified parser. Builds a parser that looks for one or many times the specified parser. Builds a parser that succeeds when the specified parser fails to match. Builds a parser that can be defined later one. Use it when a parser need to be declared before its rule can be set. Builds a parser than needs a reference to itself to be declared. Builds a parser that matches the specified parser between two other ones. Builds a parser that matches any chars before a specific parser. Builds a parser that captures the output of another parser. This is used to provide pattern matching capabilities, and optimized compiled parsers that then don't need to materialize each parser result. Builds a parser that always succeeds. Builds a parser that always succeeds. Builds a parser that always succeeds. Builds a parser that return either of the first successful of the specified parsers. Builds a parser that return either of the first successful of the specified parsers. Builds a parser that return either of the first successful of the specified parsers. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that ensure the specified parsers match consecutively. The last parser's result is then ignored. Builds a parser that creates a left-associative structure. c.f. https://en.wikipedia.org/wiki/Operator_associativity The type of the returned parser. The type of the symbol parsers. The higher-priority parser the symbols are separating. The list of operators that can be parsed and their associated result factory methods. // additive => multiplicative(("-" | "+") multiplicative) * ; var additive = multiplicative.LeftAssociative( (plus, static (a, b) => new Addition(a, b)), (minus, static (a, b) => new Subtraction(a, b)) ); Builds a parser that creates a left-associative structure. c.f. https://en.wikipedia.org/wiki/Operator_associativity The type of the returned parser. The type of the symbol parsers. The higher-priority parser the symbols are separating. The list of operators that can be parsed and their associated result factory methods. // additive => multiplicative(("-" | "+") multiplicative) * ; var additive = multiplicative.LeftAssociative( (plus, static (a, b) => new Addition(a, b)), (minus, static (a, b) => new Subtraction(a, b)) ); Builds a parser that creates a right-associative structure. c.f. https://en.wikipedia.org/wiki/Operator_associativity The type of the returned parser. The type of the symbol parsers. The higher-priority parser the symbols are separating. The list of operators that can be parsed and their associated result factory methods. // exponentiation => primary( ("^") primary) * ; var exponentiation = primary.RightAssociative( (equal, static (a, b) => new Exponent(a, b)) ); Builds a parser that creates a right-associative structure. c.f. https://en.wikipedia.org/wiki/Operator_associativity The type of the returned parser. The type of the symbol parsers. The higher-priority parser the symbols are separating. The list of operators that can be parsed and their associated result factory methods. // exponentiation => primary( ("^") primary) * ; var exponentiation = primary.RightAssociative( (equal, static (a, b) => new Exponent(a, b)) ); Builds a parser that creates a unary operation. The type of the returned parser. The type of the symbol parsers. The higher-priority parser the symbols are separating. The list of operators that can be parsed and their associated result factory methods. Builds a parser that creates a unary operation. The type of the returned parser. The type of the symbol parsers. The higher-priority parser the symbols are separating. The list of operators that can be parsed and their associated result factory methods. Builds a parser that matches whitespaces. Builds a parser that matches anything until whitespaces. Builds a parser that matches the specified text. Builds a parser that matches the specified char. Builds a parser that matches an integer. Builds a parser that matches a floating point number represented as a value. Builds a parser that matches a floating point number represented as a value. Builds a parser that matches a floating point number represented as a value. Builds a parser that matches an quoted string that can be escaped. Builds a parser that matches an identifier. Builds a parser that matches a char against a predicate. The predicate to match against each char. The minimum number of matches required. Defaults to 1. When the parser reaches the maximum number of matches it returns . Defaults to 0, i.e. no maximum size. Builds a parser that matches anything until whitespaces. Builds a parser that matches the specified text. Builds a parser that matches the specified char. Builds a parser that matches an integer. Builds a parser that matches a floating point number represented as a value. Builds a parser that matches a floating point number represented as a value. Builds a parser that matches a floating point number represented as a value. Builds a parser that matches an quoted string that can be escaped. Builds a parser that matches an identifier. Builds a parser that matches a char against a predicate. The predicate to match against each char. The minimum number of matches required. Defaults to 1. When the parser reaches the maximum number of matches it returns . Defaults to 0, i.e. no maximum size. Routes the parsing based on a custom delegate. Returns a new converting the input value of type T to the output value of type U using a custom function. The input parser type. The output parser type. Ensure the given parser is valid based on a condition, and backtracks if not. The output parser type. A Parser implementing this interface can be rewritten in a more optimized way. The result will replace the instance. Returns the parser to substitute. A Parser implementing this interface can only be triggered if the next char matches the one provided. It is used to create char lookups to optimize which Parsers need to be invoked next. Gets whether the current parser can be selected from a single char. This could vary based on the subsequent parsers. Gets the chars that can be matched next to evaluate this Parser. Gets whether the current parser needs to skip whitespaces before being invoked. This class is used to return tokens extracted from the input buffer. Scans some text. The string containing the text to scan. Reads any whitespace without generating a token. Whether some white space was read. Reads a token while the specific predicate is valid. Reads a token while the specific predicate is valid. Reads the specified text. Reads the specified text. Reads the specific expected text. Reads the specific expected text. Reads the specific expected text. Reads the specific expected text. Reads a string token enclosed in single or double quotes. This method doesn't escape the string, but only validates its content is syntactically correct. The resulting Span contains the original quotes. Represents a position in a text buffer. Map from an ASCII char to its hex value, e.g. arr['b'] == 11. 0xFF means it's not a hex digit. Indicates that an API is experimental and it may change in the future. This attribute allows call sites to be flagged with a diagnostic that indicates that an experimental feature is used. Authors can use this attribute to ship preview features in their assemblies. Initializes a new instance of the class, specifying the ID that the compiler will use when reporting a use of the API the attribute applies to. The ID that the compiler will use when reporting a use of the API the attribute applies to. Gets the ID that the compiler will use when reporting a use of the API the attribute applies to. The unique diagnostic ID. The diagnostic ID is shown in build output for warnings and errors. This property represents the unique ID that can be used to suppress the warnings or errors, if needed. Gets or sets the URL for corresponding documentation. The API accepts a format string instead of an actual URL, creating a generic URL that includes the diagnostic ID. The format string that represents a URL to corresponding documentation. An example format string is https://contoso.com/obsoletion-warnings/{0}. Specifies that this constructor sets all required members for the current type, and callers do not need to set any required members themselves. Specifies the syntax used in a string. Initializes the with the identifier of the syntax used. The syntax identifier. Initializes the with the identifier of the syntax used. The syntax identifier. Optional arguments associated with the specific syntax employed. Gets the identifier of the syntax used. Optional arguments associated with the specific syntax employed. The syntax identifier for strings containing composite formats for string formatting. The syntax identifier for strings containing date format specifiers. The syntax identifier for strings containing date and time format specifiers. The syntax identifier for strings containing format specifiers. The syntax identifier for strings containing format specifiers. The syntax identifier for strings containing JavaScript Object Notation (JSON). The syntax identifier for strings containing numeric format specifiers. The syntax identifier for strings containing regular expressions. The syntax identifier for strings containing time format specifiers. The syntax identifier for strings containing format specifiers. The syntax identifier for strings containing URIs. The syntax identifier for strings containing XML. Used to indicate a byref escapes and is not scoped. There are several cases where the C# compiler treats a as implicitly - where the compiler does not allow the to escape the method. For example: for instance methods. parameters that refer to types. parameters. This attribute is used in those instances where the should be allowed to escape. Applying this attribute, in any form, has impact on consumers of the applicable API. It is necessary for API authors to understand the lifetime implications of applying this attribute and how it may impact their users. Initialize the attribute to refer to the method on the type. The type of the builder to use to construct the collection. The name of the method on the builder to use to construct the collection. must refer to a static method that accepts a single parameter of type and returns an instance of the collection being built containing a copy of the data from that span. In future releases of .NET, additional patterns may be supported. Gets the type of the builder to use to construct the collection. Gets the name of the method on the builder to use to construct the collection. This should match the metadata name of the target method. For example, this might be ".ctor" if targeting the type's constructor. Indicates that compiler support for a particular feature is required for the location where this attribute is applied. Creates a new instance of the type. The name of the feature to indicate. The name of the compiler feature. If true, the compiler can choose to allow access to the location where this attribute is applied if it does not understand . The used for the ref structs C# feature. The used for the required members C# feature. Specifies that a type has required members or that a member is required. Reserved for use by a compiler for tracking metadata. This attribute should not be used by developers in source code.