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>>;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>;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'
;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
}
}Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
