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#define | SEQAN3_CPP_LIB_BITOPS IMPLEMENTATION_DEFINED |
| A workaround for __cpp_lib_bitops for gcc version 9.x (in C++20 mode). Those versions implemented std::countl_zero, etc, but did not define that feature detection macro.
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#define | SEQAN3_CPP_LIB_ENDIAN IMPLEMENTATION_DEFINED |
| A workaround for __cpp_lib_endian for gcc version 8.x (in C++20 mode). Those versions implemented std::endian, but did not define that feature detection macro.
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#define | SEQAN3_CPP_LIB_INT_POW2 IMPLEMENTATION_DEFINED |
| This defines __cpp_lib_int_pow2.Note: g++-9.3 -std=c++2a on ubuntu 20.04 did #define __cpp_lib_int_pow2 201806L , which is an older implementation of the __cpp_lib_int_pow2 proposal. More...
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template<class T > |
constexpr T | std::bit_ceil (T x) noexcept |
| Calculates the smallest integral power of two that is not smaller than x. More...
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template<class T > |
constexpr T | std::bit_width (T x) noexcept |
| If x is not zero, calculates the number of bits needed to store the value x, that is, 1 + floor(log2(x)). If x is zero, returns zero. More...
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template<class T > |
constexpr int | std::countl_zero (T x) noexcept |
| Returns the number of consecutive 0 bits in the value of x, starting from the most significant bit ("left"). More...
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template<class T > |
constexpr int | std::countr_zero (T x) noexcept |
| Returns the number of consecutive 0 bits in the value of x, starting from the least significant bit ("right"). More...
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template<class T > |
constexpr bool | std::has_single_bit (T x) noexcept |
| Checks if x is an integral power of two. More...
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template<class T > |
constexpr int | std::popcount (T x) noexcept |
| Returns the number of 1 bits in the value of x. More...
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The <bit> header from C++20's standard library.
- Author
- Enrico Seiler <enrico.seiler AT fu-berlin.de>
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Marcel Ehrhardt <marcel.ehrhardt AT fu-berlin.de>