TypeTraits.hpp

 
 
#pragma once
 
#include "AstGlobal.h"
#include <type_traits>
 
AST_NAMESPACE_BEGIN
 
 
template<typename F, typename... Args>
struct is_callable {
private:
    template<typename U>
    static auto test(int) -> decltype(
        std::declval<U>()(std::declval<Args>()...), // 可调用
        std::true_type{}
    );
    
    template<typename>
    static std::false_type test(...);
    
public:
    static constexpr bool value = decltype(test<F>(0))::value;
};
 
 
 
AST_NAMESPACE_END