c++ - Use templates to bind a class method to a specific prototype -
i'm looking way bind functions , class methods specific prototype.
let's want bind functions , class methods prototype
int (float) to one
void () here code
class toto { public: int test(float f) { std::cout << "toto::test " << f << std::endl; return 0; } } toto; int test(float f) { std::cout << "test " << f << std::endl; return 0; } template <typename t, t t> void func() { t(4.0f); } template <typename t> void func<int (t::*)(float), int (t::*method)(float)>() { toto::*method(5.0f); } auto main(int, char**) -> int { func<int(*)(float), &test>(); func<void (toto::*)(float), &toto::test>(); return exit_success; }
the function binding works properly, method 1 seems have syntax issues don't get. g++ gives me error :
src/main.cpp:28:6: error: parse error in template argument list src/main.cpp:28:55: error: function template partial specialization ‘func<int (t::*)(float), <expression error> >’ not allowed any ideas ?
you cannot partial specialize template function, can class/struct:
namespace details { template <typename t, t t> struct func_impl { void operator () () const { t(4.0f); } }; template <typename t, int (t::*method)(float)> struct func_impl<int (t::*)(float), method> { void operator () () const { (toto.*method)(5.0f); } }; } template <typename t, t t> void func() { details::func_impl<t, t>{}(); }