38 lines
1.7 KiB
C
38 lines
1.7 KiB
C
|
#pragma once
|
||
|
|
|
||
|
|
namespace TypeMagic
|
||
|
|
{
|
||
|
|
/** "Cleans" the given type T by stripping references (&) and cv-qualifiers (const, volatile) from it
|
||
|
|
* const int => int
|
||
|
|
* QString & => QString
|
||
|
|
* const unsigned long long & => unsigned long long
|
||
|
|
*
|
||
|
|
* Usage:
|
||
|
|
* using Cleaned = Detail::CleanType<const int>;
|
||
|
|
* static_assert(std::is_same<Cleaned, int>, "Cleaned == int");
|
||
|
|
*/
|
||
|
|
// the order of remove_cv and remove_reference matters!
|
||
|
|
template <typename T>
|
||
|
|
using CleanType = typename std::remove_cv<typename std::remove_reference<T>::type>::type;
|
||
|
|
|
||
|
|
/// For functors (structs with operator()), including lambdas, which in **most** cases are functors
|
||
|
|
/// "Calls" Function<Ret(*)(Arg)> or Function<Ret(C::*)(Arg)>
|
||
|
|
template <typename T> struct Function : public Function<decltype(&T::operator())> {};
|
||
|
|
/// For function pointers (&function), including static members (&Class::member)
|
||
|
|
template <typename Ret, typename Arg> struct Function<Ret(*)(Arg)> : public Function<Ret(Arg)> {};
|
||
|
|
/// Default specialization used by others.
|
||
|
|
template <typename Ret, typename Arg> struct Function<Ret(Arg)>
|
||
|
|
{
|
||
|
|
using ReturnType = Ret;
|
||
|
|
using Argument = Arg;
|
||
|
|
};
|
||
|
|
/// For member functions. Also used by the lambda overload if the lambda captures [this]
|
||
|
|
template <class C, typename Ret, typename Arg> struct Function<Ret(C::*)(Arg)> : public Function<Ret(Arg)> {};
|
||
|
|
template <class C, typename Ret, typename Arg> struct Function<Ret(C::*)(Arg) const> : public Function<Ret(Arg)> {};
|
||
|
|
/// Overload for references
|
||
|
|
template <typename F> struct Function<F&> : public Function<F> {};
|
||
|
|
/// Overload for rvalues
|
||
|
|
template <typename F> struct Function<F&&> : public Function<F> {};
|
||
|
|
// for more info: https://functionalcpp.wordpress.com/2013/08/05/function-traits/
|
||
|
|
}
|