bit_manip.h

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#ifndef GUL14_BIT_MANIP_H_
#define GUL14_BIT_MANIP_H_
 
#include <cassert>
#include <type_traits>
 
#include "gul14/internal.h"
 
namespace gul14 {
 
template <typename T>
using BitFunctionReturnType =
    std::enable_if_t<
            std::is_integral<T>::value
            and not std::is_same<std::decay_t<T>, bool>::value,
        std::decay_t<T>
    >;
 
template <typename T = unsigned, typename ReturnT = BitFunctionReturnType<T>>
auto constexpr inline bit_set(unsigned bit) noexcept -> ReturnT {
    assert(bit < sizeof(T) * 8);
    return static_cast<ReturnT>(std::make_unsigned_t<T>{1u} << bit);
}
 
template <typename T, typename ReturnT = BitFunctionReturnType<T>>
auto constexpr inline bit_set(T previous, unsigned bit) noexcept -> ReturnT {
    return previous | bit_set<T>(bit);
}
 
template <typename T, typename ReturnT = BitFunctionReturnType<T>>
auto constexpr inline bit_reset(T previous, unsigned bit) noexcept -> ReturnT {
    return static_cast<ReturnT>(previous & ~bit_set<T>(bit));
}
 
template <typename T, typename ReturnT = BitFunctionReturnType<T>>
auto constexpr inline bit_flip(T previous, unsigned bit) noexcept -> ReturnT {
    return previous ^ bit_set<T>(bit);
}
 
template <typename T>
bool constexpr inline bit_test(T bits, unsigned bit) noexcept {
    return bits & bit_set<T>(bit);
}
 
} // namespace gul14
 
#endif
 
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