Linux Manuals

std::hash(std::experimental::shared_ptr) – std::hash(std::experimental::shared_ptr) Synopsis template<class T> struct hash<std::experimental::shared_ptr<T>>; (library fundamentals TS) The template specialization of std::hash for std::experimental::shared_ptr<T> allows users to obtain hashes of objects of type std::experimental::shared_ptr<T>. For a given std::experimental::shared_ptr<T> p, this specialization ensures that std::hash<std::experimental::shared_ptr<T>>()(p) == std::hash<T*>()(p.get()). Example  This section is incomplete  Reason: no example See also hash hash function object         (class…

std::hash(std::experimental::propagate_const) – std::hash(std::experimental::propagate_const) Synopsis Defined in header <experimental/propagate_const> template<class T> struct hash<std::experimental::propagate_const<T>>; (library fundamentals TS v2) The template specialization of std::hash for std::experimental::propagate_const<T> allows users to obtain hashes of objects of type std::experimental::propagate_const<T>. For a given std::experimental::propagate_const<T> p, this specialization ensures that std::hash<std::experimental::propagate_const<T>>()(p) == std::hash<T>()(p.t_), where p.t_ is the pointer-like object wrapped by p. Example…

std::hash(std::experimental::observer_ptr) – std::hash(std::experimental::observer_ptr) Synopsis Defined in header <experimental/memory> template<class T> struct hash<std::experimental::observer_ptr<T>>; (library fundamentals TS v2) The template specialization of std::hash for std::experimental::observer_ptr<T> allows users to obtain hashes of objects of type std::experimental::observer_ptr<T>. For a given std::experimental::observer_ptr<T> p, this specialization ensures that std::hash<std::experimental::observer_ptr<T>>()(p) == std::hash<T*>()(p.get()). Example  This section is incomplete  Reason: no example See also…

std::hash(std::bitset) – std::hash(std::bitset) Synopsis template<size_t N> struct hash<bitset<N>>; (since C++11) The template specialization of std::hash for std::bitset<N> allows users to obtain hashes of objects of type std::bitset<N>. Example The following code shows one possible output of a hash function used on several bitsets: // Run this code #include <iostream> #include <bitset> #include <functional> int main()…

std::has_virtual_destructor – std::has_virtual_destructor Synopsis Defined in header<type_traits> template <class T> (since C++ 11) struct has_virtual_destructor; If T is a type with a virtual destructor, provides the member constant value equal true. For any other type, value is false. If T is a non-union class type, T shall be a complete type; otherwise, the behavior is…

std::has_unique_object_representations – std::has_unique_object_representations Synopsis Defined in header<type_traits> template <class T> (since C++ 17) struct has_unique_object_representations; If T is TriviallyCopyable and if any two objects of type T with the same value have the same object_representation, provides the member constant value equal true. For any other type, value is false. For the purpose of this trait,…

std::has_trivial_default_constructor< _Tp > – Synopsis Inherits std::integral_constant< bool, __has_trivial_constructor(_Tp)>. Public Types typedef integral_constant < bool, __v > type" typedef bool value_type Public Member Functions constexpr operator value_type () Static Public Attributes static constexpr bool value Detailed Description template<typename _Tp>struct std::has_trivial_default_constructor< _Tp > has_trivial_default_constructor (temporary legacy) Definition at line 1211 of file type_traits. Author Generated automatically…

std::has_trivial_copy_constructor< _Tp > – Synopsis Inherits std::integral_constant< bool, __has_trivial_copy(_Tp)>. Public Types typedef integral_constant < bool, __v > type" typedef bool value_type Public Member Functions constexpr operator value_type () Static Public Attributes static constexpr bool value Detailed Description template<typename _Tp>struct std::has_trivial_copy_constructor< _Tp > has_trivial_copy_constructor (temporary legacy) Definition at line 1217 of file type_traits. Author Generated automatically…

std::has_trivial_copy_assign< _Tp > – Synopsis Inherits std::integral_constant< bool, __has_trivial_assign(_Tp)>. Public Types typedef integral_constant < bool, __v > type" typedef bool value_type Public Member Functions constexpr operator value_type () Static Public Attributes static constexpr bool value Detailed Description template<typename _Tp>struct std::has_trivial_copy_assign< _Tp > has_trivial_copy_assign (temporary legacy) Definition at line 1223 of file type_traits. Author Generated automatically…

std::has_facet – std::has_facet Synopsis Defined in header<locale> template <class Facet> (until C++ 11) bool has_facet(const locale &loc) throw(); template <class Facet> (since C++ 11) bool has_facet(const locale &loc) noexcept; Checks if the locale loc implements the facet Facet. Parameters loc – the locale object to query Return value Returns true if the facet Facet was…

std::hardware_destructive_interference_size,std::hardware_constructive_interference_size – std::hardware_destructive_interference_size,std::hardware_constructive_interference_size Synopsis Defined in header <new> inline constexpr std::size_t (1) (since C++17) hardware_destructive_interference_size = /*implementation-defined*/; inline constexpr std::size_t (2) (since C++17) hardware_constructive_interference_size = /*implementation-defined*/; 1) Minimum offset between two objects to avoid false sharing. Guaranteed to be at least alignof(std::max_align_t) struct keep_apart { alignas(std::hardware_destructive_interference_size) std::atomic<int> cat; alignas(std::hardware_destructive_interference_size) std::atomic<int> dog; }; 2) Maximum size…

std::gslice_array<T>::operator= – std::gslice_array<T>::operator= Synopsis void operator=(const T &value) const; (1) void operator=(const std::valarray<T> &val_arr) const; (2) const gslice_array & operator=(const gslice_array &sl_arr) const; (3)(since C++ 11) Assigns values to all referred elements. 1) Assigns value to all of the elements. 2) Assigns the elements of val_arr to the referred to elements of *this. 3) Assigns…

std::gslice_array<T>::~gslice_array – std::gslice_array<T>::~gslice_array Synopsis ~gslice_array(); Destroys the indexes in the array. The elements referred to by the object are not modified.

std::gslice_array – std::gslice_array Synopsis Defined in header <valarray> template< class T > class gslice_array; std::gslice_array is a helper template used by std::gslice subscript operator. It has reference semantics to a subset of the array specified by the std::gslice object. Member types Type Definition value_type T Member functions               constructs a gslice_array constructor (public member function)               destroys…

std::gslice – std::gslice Synopsis Defined in header <valarray> class gslice; std::gslice is the selector class that identifies a subset of std::valarray indices defined by a multi-level set of strides and sizes. Objects of type std::gslice can be used as indices with valarray’s operator[] to select, for example, columns of a multidimensional array represented as a…

std::greater_equal<void> – std::greater_equal<void> Synopsis Defined in header<functional> template <> (since C++ 14) class greater_equal<void>; std::greater_equal<> is a specialization of std::greater_equal with parameter and return type deduced. Member types Member type Definition is_transparent /* unspecified */ Member functions            tests if the lhs compares greater or equal than rhs operator() (public member function)  std::greater_equal<>::operator() template< class T,…

std::greater<void> – std::greater<void> Synopsis Defined in header<functional> template <> (since C++ 14) class greater<void>; std::greater<> is a specialization of std::greater with parameter and return type deduced. Member types Member type Definition is_transparent /* unspecified */ Member functions            tests if the lhs compares greater than rhs operator() (public member function)  std::greater<>::operator() template< class T, class U>…

std::gmtime – std::gmtime Synopsis Defined in header<ctime> std::tm *gmtime(const std::time_t *time); Converts given time since epoch as std::time_t value into calendar time, expressed in Coordinated Universal Time (UTC). Parameters time – pointer to a time_t object to convert Return value Pointer to a static internal std::tm object on success, or null pointer otherwise. The structure…

std::getwchar – std::getwchar Synopsis Defined in header <cwchar> wint_t getwchar(); Reads the next wide character from stdin. Parameters (none) Return value The obtained wide character or WEOF if an error has occurred or the end of file reached See also         reads a character from stdin getchar (function)         gets a wide character from a file stream…

std::gets – std::gets Synopsis Defined in header <cstdio> char* gets( char* str ); (deprecated in C++11)                             (removed in C++14) Reads stdin into given character string until a newline character is found or end-of-file occurs. Parameters str – character string to be written Return value str on success, NULL on failure. If the failure has been…