std::function 模板类型推导

Question

我发现了 std::function 和类型推导的以下行为，这对我来说是出乎意料的：

#include <functional>

template <typename T>
void stdfunc_test(std::function<T(T)> func) {};

int test_func(int arg)
{
    return arg + 2;
}

int main()
{
    stdfunc_test([](int _) {return _ + 2;});
    stdfunc_test(test_func);
}

main 中的两行都导致错误：

no instance of function template "stdfunc_test" matches the argument list

在 Visual Studio 2015 年尝试编译时。

为什么类型推导不从函数类型中推导模板类型，有解决方法吗？

Answer 1

模板参数推导期间不执行隐式转换，除了：temp.deduct.call

In general, the deduction process attempts to find template argument values that will make the deduced A identical to A (after the type A is transformed as described above). However, there are three cases that allow a difference:

If the original P is a reference type, the deduced A (i.e., the type referred to by the reference) can be more cv-qualified than the transformed A.

The transformed A can be another pointer or pointer to member type that can be converted to the deduced A via a function pointer conversion ([conv.fctptr]) and/or qualification conversion ([conv.qual]).

If P is a class and P has the form simple-template-id, then the transformed A can be a derived class of the deduced A. Likewise, if P is a pointer to a class of the form simple-template-id, the transformed A can be a pointer to a derived class pointed to by the deduced A.

但是，如果模板形参不参与模板实参推导，则会进行隐式转换：(temp.arg.explicit)

Implicit conversions (Clause [conv]) will be performed on a function argument to convert it to the type of the corresponding function parameter if the parameter type contains no template-parameters that participate in template argument deduction. [ Note: Template parameters do not participate in template argument deduction if they are explicitly specified.

因此，如果您显式指定模板参数，它应该可以工作：

stdfunc_test<int>([](int _) {return _ + 2;});
stdfunc_test<int>(test_func);

Answer 2

您可以使用模板推导函数和函子的签名：

#include<functional>

template<class T>
struct AsFunction
    : public AsFunction<decltype(&T::operator())>
{};

template<class ReturnType, class... Args>
struct AsFunction<ReturnType(Args...)> {
  using type = std::function<ReturnType(Args...)>;
};

template<class ReturnType, class... Args>
struct AsFunction<ReturnType(*)(Args...)> {
  using type = std::function<ReturnType(Args...)>;
};


template<class Class, class ReturnType, class... Args>
struct AsFunction<ReturnType(Class::*)(Args...) const> {
  using type = std::function<ReturnType(Args...)>;
};

template<class F>
auto toFunction( F f ) -> typename AsFunction<F>::type {
  return {f};
}

template <typename T>
void stdfunc_test(std::function<T(T)> func) {};

int test_func(int arg)
{
    return arg + 2;
}


int main()
{

    stdfunc_test( toFunction([](int _) {return _ + 2;}) );
    stdfunc_test( toFunction(test_func) );
    return 0;
}

你可以在这里现场试用：http://fiddle.jyt.io/github/d4ab355eb2ab7fc4cc0a48da261f0127

std::function 模板类型推导

Template type deduction with std::function

c++

templates

c++11

std-function