zero.hpp

Go to the documentation of this file.

// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_BASIC_ZERO_H
#define pRC_CORE_BASIC_ZERO_H
 
#include <prc/core/basic/concepts.hpp>
 
namespace pRC
{
    template<class T = Void>
    struct Zero;
 
    template<class T>
    struct Zero<T const> : Zero<T>
    {
    };
 
    template<IsVoid T>
    struct Zero<T>
    {
        template<class F>
            requires IsBool<F> || IsIntegral<F>
        constexpr operator F() const
        {
            return Zero<F>()();
        }
    };
 
    template<IsBool T>
    struct Zero<T>
    {
        constexpr T operator()() const
        {
            return false;
        }
    };
 
    template<IsIntegral T>
    struct Zero<T>
    {
        constexpr T operator()() const
        {
            return 0;
        }
    };
}
#endif // pRC_CORE_BASIC_ZERO_H