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src: add support for constexpr bele.h

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This commit is contained in:
Markus F.X.J. Oberhumer
2024-05-26 02:27:51 +02:00
parent 43f9b90c92
commit c3341ce4dc
8 changed files with 499 additions and 172 deletions
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src/util/cxxlib.h
+11 -11
View File
@@ -177,23 +177,23 @@ forceinline constexpr bool has_single_bit(T x) noexcept {
**************************************************************************/
template <class T>
inline T align_down(const T &x, const T &alignment) noexcept {
assert_noexcept(has_single_bit(alignment));
T r;
inline constexpr T align_down(const T &x, const T &alignment) noexcept {
// assert_noexcept(has_single_bit(alignment));
T r = {};
r = (x / alignment) * alignment;
return r;
}
template <class T>
inline T align_up(const T &x, const T &alignment) noexcept {
assert_noexcept(has_single_bit(alignment));
T r;
inline constexpr T align_up(const T &x, const T &alignment) noexcept {
// assert_noexcept(has_single_bit(alignment));
T r = {};
r = ((x + (alignment - 1)) / alignment) * alignment;
return r;
}
template <class T>
inline T align_gap(const T &x, const T &alignment) noexcept {
assert_noexcept(has_single_bit(alignment));
T r;
inline constexpr T align_gap(const T &x, const T &alignment) noexcept {
// assert_noexcept(has_single_bit(alignment));
T r = {};
r = align_up(x, alignment) - x;
return r;
}
@@ -232,14 +232,14 @@ struct UnsignedSizeOf {
// a static_cast that does not trigger -Wcast-align warnings
template <class Result, class From>
forceinline Result ptr_static_cast(From *ptr) noexcept {
forceinline constexpr Result ptr_static_cast(From *ptr) noexcept {
static_assert(std::is_pointer_v<Result>);
static_assert(!std::is_const_v<std::remove_pointer_t<Result> >); // enforce same constness
// NOLINTNEXTLINE(bugprone-multi-level-implicit-pointer-conversion)
return static_cast<Result>(static_cast<void *>(ptr));
}
template <class Result, class From>
forceinline Result ptr_static_cast(const From *ptr) noexcept {
forceinline constexpr Result ptr_static_cast(const From *ptr) noexcept {
static_assert(std::is_pointer_v<Result>);
static_assert(std::is_const_v<std::remove_pointer_t<Result> >); // required
// NOLINTNEXTLINE(bugprone-multi-level-implicit-pointer-conversion)
src/util/system_headers.h
+3
View File
@@ -119,6 +119,9 @@ static_assert(sizeof(void *) == sizeof(long));
#endif
// C++ freestanding headers
#if __cplusplus >= 202002L
#include <bit>
#endif
#include <cstddef>
#include <exception>
#include <new>