请考虑以下代码:
#include <iostream>
//Number1
template<typename T1, typename T2>
auto max (T1 a, T2 b)
{
std::cout << "auto max(T1 a, T2 b)" <<std::endl;
return b < a ? a : b;
}
//Number2
template<typename RT, typename T1, typename T2>
RT max (T1 a, T2 b)
template < class A, class B, class R = A >
void addMultiplyOperation( std::function< R ( const A&, const B& ) > func )
{
...
}
addMultiplyOperation< float, int >( []( float a, int b ) { return a * b; } );
这会导致编译器错误:
In function 'int main(int, char**)':
error: n