"function pointers in C#" Code Answer's
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function pointers in C#
delegate int Func1(string s);
delegate Func1 Func2(Func1 f);
// Function pointer equivalent without calling convention
delegate*<string, int>;
delegate*<delegate*<string, int>, delegate*<string, int>>;
// Function pointer equivalent with calling convention
delegate* managed<string, int>;
delegate*<delegate* managed<string, int>, delegate*<string, int>>;
Source: docs.microsoft.com
function pointers in C#
pointer_type
: ...
| funcptr_type
;
funcptr_type
: 'delegate' '*' calling_convention_specifier? '<' funcptr_parameter_list funcptr_return_type '>'
;
calling_convention_specifier
: 'managed'
| 'unmanaged' ('[' unmanaged_calling_convention ']')?
;
unmanaged_calling_convention
: 'Cdecl'
| 'Stdcall'
| 'Thiscall'
| 'Fastcall'
| identifier (',' identifier)*
;
funptr_parameter_list
: (funcptr_parameter ',')*
;
funcptr_parameter
: funcptr_parameter_modifier? type
;
funcptr_return_type
: funcptr_return_modifier? return_type
;
funcptr_parameter_modifier
: 'ref'
| 'out'
| 'in'
;
funcptr_return_modifier
: 'ref'
| 'ref readonly'
;
Source: docs.microsoft.com
function pointers in C#
unsafe class Example {
void Conversions() {
delegate*<int, int, int> p1 = ...;
delegate* managed<int, int, int> p2 = ...;
delegate* unmanaged<int, int, int> p3 = ...;
p1 = p2; // okay p1 and p2 have compatible signatures
Console.WriteLine(p2 == p1); // True
p2 = p3; // error: calling conventions are incompatible
}
}
Source: docs.microsoft.com
function pointers in C#
//This method has a managed calling convention. This is the same as leaving the managed keyword off.
delegate* managed<int, int>;
// This method will be invoked using whatever the default unmanaged calling convention on the runtime
// platform is. This is platform and architecture dependent and is determined by the CLR at runtime.
delegate* unmanaged<int, int>;
// This method will be invoked using the cdecl calling convention
// Cdecl maps to System.Runtime.CompilerServices.CallConvCdecl
delegate* unmanaged[Cdecl] <int, int>;
// This method will be invoked using the stdcall calling convention, and suppresses GC transition
// Stdcall maps to System.Runtime.CompilerServices.CallConvStdcall
// SuppressGCTransition maps to System.Runtime.CompilerServices.CallConvSuppressGCTransition
delegate* unmanaged[Stdcall, SuppressGCTransition] <int, int>;
Source: docs.microsoft.com
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