I have discovered the following behaviour with std::function
and type deduction, which was unexpected for me:
#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);
}
Both lines in main
result in error:
no instance of function template "stdfunc_test" matches the argument list
When attempting to compile in Visual Studio 2015.
Why doesn't the type deduction deduct template type from the function type, and is there a workaround for it?
No implicit conversion is performed during template argument deduction, except: 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.
However, if the template parameter doesn't participate in template argument deduction, implicit conversion will be performed: (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.
So, if you explicitly specify the template argument, it should work:
stdfunc_test<int>([](int _) {return _ + 2;});
stdfunc_test<int>(test_func);
You can use templates to deduce the signature of functions and functors:
#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;
}
you can try it live here: http://fiddle.jyt.io/github/d4ab355eb2ab7fc4cc0a48da261f0127
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