cosmopolitan/ctl/integral_constant.h

// -*-mode:c++;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8-*-
// vi: set et ft=cpp ts=4 sts=4 sw=4 fenc=utf-8 :vi
#ifndef CTL_INTEGRAL_CONSTANT_H_
#define CTL_INTEGRAL_CONSTANT_H_

namespace ctl {

template<class T, T v>
struct integral_constant
{
    static constexpr T value = v;
    typedef T value_type;
    typedef integral_constant type;

    constexpr operator value_type() const noexcept
    {
        return value;
    }

    constexpr value_type operator()() const noexcept
    {
        return value;
    }
};

typedef integral_constant<bool, true> true_type;
typedef integral_constant<bool, false> false_type;

} // namespace ctl

#endif // CTL_INTEGRAL_CONSTANT_H_