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feat(bit): add a demo and add some functions for the bit class

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DarkSharpness
2024-07-09 23:19:36 +08:00
parent 39254c4557
commit 5f82fe975c
3 changed files with 51 additions and 4 deletions
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12
include/bit.h
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@ -26,7 +26,7 @@ struct Bit {
public:
static constexpr std::size_t _Bit_Len = _Nm;
constexpr Bit(target_size_t data = 0) : _M_data(data) {}
constexpr Bit(target_size_t data = {}) : _M_data(data) {}
template <std::size_t ..._Lens>
constexpr Bit(Bit<_Lens> ...args) requires ((_Lens + ...) == _Nm) :
@ -54,6 +54,16 @@ struct Bit {
constexpr operator target_size_t() const { return this->_M_data; }
template <std::size_t _Hi, std::size_t _Lo = _Hi>
constexpr auto set(Bit <_Hi - _Lo + 1> val) {
static_cast <void> (this->slice<_Hi, _Lo>());
const auto mask = // Mask those bit in the middle
(target_size_t(1) << (_Hi + 1)) - (target_size_t(1) << _Lo);
const auto data = // Set those bit in the middle
static_cast <target_size_t> (val) << _Lo;
this->_M_data = (this->_M_data & ~mask) | data;
}
template <std::size_t _Hi, std::size_t _Lo = _Hi>
constexpr auto slice() const -> Bit <_Hi - _Lo + 1> {
static_assert(_Lo <= _Hi, "Bit::slice: _Lo should be no greater than _Hi");