__stdcall 函数指针的模板部分特化 [英] Template partial specialization for __stdcall function pointer
本文介绍了__stdcall 函数指针的模板部分特化的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
typedef bool (*my_function_f)(int, double);
typedef bool (__stdcall *my_function_f2)(int, double);
// ^^^^^^^^^
template<class F> class TFunction;
template<class R, class T0, class T1>
class TFunction<R(*)(T0,T1)>
{
typedef R (*func_type)(T0,T1);
};
int main()
{
TFunction<my_function_f> t1; // works on x64 and win32
TFunction<my_function_f2> t2; // works on x64 and doesn't work on win32
return 0;
}
上面的代码在 Visual C++ 2010 中给了我以下错误:
The code above gives me the following error in Visual C++ 2010:
1>e:\project\orwell\head\multimapwizard\trunk\externals.cpp(49): error C2079: 't2' uses undefined class 'Externals::TFunction<F>'
1> with
1> [
1> F=Externals::my_function_f2
1> ]
如您所见,__stdcall
修饰符存在问题.这是编译器的错误吗?
As you can see the problem with __stdcall
modifier. Is this the compiler bug?
推荐答案
不,这是设计使然.调用约定是函数声明的很大一部分,您的模板函数使用默认调用约定.除非您使用/Gz 编译,否则这不是 __stdcall.默认为/Gd, __cdecl.
No, this is by design. The calling convention is very much part of the function declaration, your template function uses the default calling convention. Which is not __stdcall unless you compile with /Gz. The default is /Gd, __cdecl.
当您面向 x64 时代码会编译,因为它只有一种调用约定.
The code compiles when you target x64 because it blissfully has only one calling convention.
修复:
template<class R, class T0, class T1>
class TFunction<R (__stdcall *)(T0,T1)>
{
// etc..
};
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