Section 3: library functions
std::assume_aligned – std::assume_aligned Synopsis Defined in header<memory> template <std::size_t N, class T> (since C++ 20) [[nodiscard]] constexpr T *assume_aligned(T *ptr); Informs the implementation that the object ptr points to is aligned to at least N.The implementation may use this information to generate more efficient code, but it might only make this assumption if the object…
std::assoc_legendre,std::assoc_legendref,std::assoc_legendrel – std::assoc_legendre,std::assoc_legendref,std::assoc_legendrel Synopsis double assoc_legendre(unsigned int n, unsigned int m, double x); float assoc_legendre(unsigned int n, unsigned int m, float x); long double assoc_legendre(unsigned int n, unsigned int m, long double x); (1)(since C++ 17) float assoc_legendref(unsigned int n, unsigned int m, float x); long double assoc_legendrel(unsigned int n, unsigned int m, long double…
std::assoc_laguerre,std::assoc_laguerref,std::assoc_laguerrel – std::assoc_laguerre,std::assoc_laguerref,std::assoc_laguerrel Synopsis double assoc_laguerre(unsigned int n, unsigned int m, double x); float assoc_laguerre(unsigned int n, unsigned int m, float x); long double assoc_laguerre(unsigned int n, unsigned int m, long double x); (1)(since C++ 17) float assoc_laguerref(unsigned int n, unsigned int m, float x); long double assoc_laguerrel(unsigned int n, unsigned int m, long double…
std::asinh,std::asinhf,std::asinhl – std::asinh,std::asinhf,std::asinhl Synopsis Defined in header <cmath> float asinh ( float arg ); (1) (since C++11) float asinhf( float arg ); double asinh ( double arg ); (2) (since C++11) long double asinh ( long double arg ); (3) (since C++11) long double asinhl( long double arg ); double asinh ( IntegralType arg );…
std::asinh(std::complex) – std::asinh(std::complex) Synopsis Defined in header<complex> template <class T> (since C++ 11) complex<T> asinh(const complex<T> &z); Computes complex arc hyperbolic sine of a complex value z with branch cuts outside the interval [−i; +i] along the imaginary axis. Parameters z – complex value Return value If no errors occur, the complex arc hyperbolic sine…
std::asin,std::asinf,std::asinl – std::asin,std::asinf,std::asinl Synopsis Defined in header <cmath> float asin ( float arg ); float asinf( float arg ); (since C++11) double asin ( double arg ); (1) (2) long double asin ( long double arg ); long double asinl( long double arg ); (3) (since C++11) double asin ( IntegralType arg ); (4) (since…
std::asin(std::valarray) – std::asin(std::valarray) Synopsis Defined in header<valarray> template <class T> valarray<T> asin(const valarray<T> &va); For each element in va computes arc sine of the value of the element. Parameters va – value array to apply the operation to Return value Value array containing arc sines of the values in va. Notes Unqualified function (asin) is…
std::asin(std::complex) – std::asin(std::complex) Synopsis Defined in header<complex> template <class T> (since C++ 11) complex<T> asin(const complex<T> &z); Computes complex arc sine of a complex value z. Branch cut exists outside the interval [−1 ; +1] along the real axis. Parameters z – complex value Return value If no errors occur, complex arc sine of z…
std::asctime – std::asctime Synopsis Defined in header<ctime> char *asctime(const std::tm *time_ptr); Converts given calendar time std::tm to a textual representation of the following fixed 25-character form: Www Mmm dd hh:mm:ss yyyy\n * Www – three-letter English abbreviated day of the week from time_ptr->tm_wday, one of Mon, Tue, Wed, Thu, Fri, Sat, Sun. * Mmm –…
std::as_const – std::as_const Synopsis Defined in header<utility> template <class T> (1)(since C++ 17) constexpr std::add_const_t<T> &as_const(T &t) noexcept; template <class T> (2)(since C++ 17) void as_const(const T &&) = delete; 1) Forms lvalue reference to const type of t 2) const rvalue reference overload is deleted to disallow rvalue arguments Possible implementation template <class T>…
std::as_bytes,std::as_writable_bytes – std::as_bytes,std::as_writable_bytes Synopsis template <class T, std::size_t N> (1) std::span<const std::byte, S /* see below */> as_bytes(std::span<T, N> s) noexcept; template <class T, std::size_t N> (2) std::span<std::byte, S /* see below */> as_writable_bytes(std::span<T, N> s) noexcept; Obtains a view to the object representation of the elements of the span s. If N is std::dynamic_extent,…
std::array<T,N>::swap – std::array<T,N>::swap Synopsis void swap(array &other) noexcept(/* see below */); (since C++ 11)(until C++ 20) constexpr void swap(array &other) noexcept(/* see below */); (since C++ 20) Exchanges the contents of the container with those of other. Does not cause iterators and references to associate with the other container. Parameters other – container to exchange…
std::arg(std::complex) – std::arg(std::complex) Synopsis Defined in header <complex> template< class T > (1) T arg( const complex<T>& z ); long double arg( long double z ); (2) (since C++11) template< class DoubleOrInteger > (3) (since C++11) double arg( DoubleOrInteger z ); float arg( float z ); (4) (since C++11) Calculates the phase angle (in radians)…
std::apply – std::apply Synopsis Defined in header <tuple> template <class F, class Tuple> (since C++17) constexpr decltype(auto) apply(F&& f, Tuple&& t); Invoke the Callable object f with a tuple of arguments. Parameters f – Callable object to be invoked t – tuple whose elements to be used as arguments to f Return value The value…
std::any_cast – std::any_cast Synopsis template <class T> (1)(since C++ 17) T any_cast(const any &operand); template <class T> (2)(since C++ 17) T any_cast(any &operand); template <class T> (3)(since C++ 17) T any_cast(any &&operand); template <class T> (4)(since C++ 17) const T *any_cast(const any *operand) noexcept; template <class T> (5)(since C++ 17) T *any_cast(any *operand) noexcept; Performs…
std::any::type – std::any::type Synopsis const std::type_info &type() const noexcept; (since C++ 17) Queries the contained type. Parameters (none) Return value The typeid of the contained value if instance is non-empty, otherwise typeid(void).
std::any::swap – std::any::swap Synopsis void swap(any &other) noexcept; (since C++ 17) Swaps the content of two any objects. Parameters other – object to swap with Return value (none)
std::any::reset – std::any::reset Synopsis void reset() noexcept; (since C++ 17) If not empty, destroys the contained object. Parameters (none) Return value (none)
std::any::operator= – std::any::operator= Synopsis any &operator=(const any &rhs); (1)(since C++ 17) any & operator=(any &&rhs) noexcept; (2)(since C++ 17) template <typename ValueType> (3)(since C++ 17) any & operator=(ValueType &&rhs); Assigns contents to the contained value. 1) Assigns by copying the state of rhs, as if by any(rhs).swap(*this). 2) Assigns by moving the state of rhs,…
std::any::has_value – std::any::has_value Synopsis bool has_value() const noexcept; (since C++17) Checks whether the object contains a value. Parameters (none) Return value true if instance contains a value, otherwise false.