The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
std::function<R(Args…)>::swap – std::function<R(Args…)>::swap Synopsis void swap(function &other) noexcept; (since C++ 11) Exchanges the stored callable objects of *this and other. Parameters other – function wrapper to exchange the stored callable object with Return value (none)
std::function<R(Args…)>::operatorbool – std::function<R(Args…)>::operatorbool Synopsis explicit operator bool() const noexcept; (since C++11) Checks whether *this stores a callable function target, i.e. is not empty. Parameters (none) Return value true if *this stores a callable function target, false otherwise. Example // Run this code #include <functional> #include <iostream> void sampleFunction() { std::cout << "This is the sample…
std::function<R(Args…)>::operator= – std::function<R(Args…)>::operator= Synopsis function &operator=(const function &other); (1)(since C++ 11) function & operator=(function &&other); (2)(since C++ 11) function & operator=(std::nullptr_t); (since C++ 11)(until C++ 17) function & operator=(std::nullptr_t) noexcept; (since C++ 17) template <class F> (3)(4)(since C++ 11) function & operator=(F &&f); template <class F> (5)(since C++ 11) function & operator=(std::reference_wrapper<F> f) noexcept; Assigns…
std::function<R(Args…)>::~function – std::function<R(Args…)>::~function Synopsis ~function(); (since C++11) Destroys the std::function instance. If the std::function is not empty, its target is destroyed also.
std::function<R(Args…)>::assign – std::function<R(Args…)>::assign Synopsis template< class F, class Alloc > (since C++11) void assign( F&& f, const Alloc& alloc ); (removed in C++17) Initializes the target with f. alloc is used to allocate memory for any internal data structures that the function might use. Equivalent to function(allocator_arg, alloc, std::forward<F>(f)).swap(*this) Parameters f – callable function to…
std::function – std::function Synopsis Defined in header <functional> template< class > (since C++11) class function; /* undefined */ template< class R, class… Args > (since C++11) class function<R(Args…)>; Class template std::function is a general-purpose polymorphic function wrapper. Instances of std::function can store, copy, and invoke any Callable target — functions, lambda_expressions, bind_expressions, or other function…
std::ftell – std::ftell Synopsis Defined in header <cstdio> long ftell( std::FILE* stream ); Returns the current value of the file position indicator for the file stream stream. If the stream is open in binary mode, the value obtained by this function is the number of bytes from the beginning of the file. If the stream…
std::basic_fstream – std::basic_fstream Synopsis Defined in header <fstream> template< class CharT, class Traits = std::char_traits<CharT> > class basic_fstream : public std::basic_iostream<CharT, Traits> The class template basic_fstream implements high-level input/output operations on file based streams. It interfaces a file-based streambuffer (std::basic_filebuf) with the high-level interface of (std::basic_iostream). A typical implementation of std::basic_fstream holds only one non-derived…
std::fsetpos – std::fsetpos Synopsis Defined in header<cstdio> int fsetpos(std::FILE *stream, const std::fpos_t *pos); Sets the file position indicator and the multibyte parsing state (if any) for the C file stream stream according to the value pointed to by pos. Besides establishing new parse state and position, a call to this function undoes the effects of…
std::fseek – std::fseek Synopsis Defined in header<cstdio> int fseek(std::FILE *stream, long offset, int origin); Sets the file position indicator for the file stream stream. If the stream is open in binary mode, the new position is exactly offset bytes measured from the beginning of the file if origin is SEEK_SET, from the current file position…
std::front_inserter – std::front_inserter Synopsis Defined in header <iterator> template< class Container > (until C++20) std::front_insert_iterator<Container> front_inserter( Container& c ); template< class Container > (since C++20) constexpr std::front_insert_iterator<Container> front_inserter( Container& c ); front_inserter is a convenience function template that constructs a std::front_insert_iterator for the container c with the type deduced from the type of the argument….
std::front_insert_iterator<Container>::operator= – std::front_insert_iterator<Container>::operator= Synopsis front_insert_iterator<Container> &(until C++ 11) operator=(typename Container::const_reference value); front_insert_iterator<Container> &(since C++ 11) operator=(const typename Container::value_type &value); (until C++ 20) constexpr front_insert_iterator<Container> &(1)(since C++ 20) operator=(const typename Container::value_type &value); front_insert_iterator<Container> &(since C++ 11) operator=(typename Container::value_type &&value); (2)(until C++ 20) constexpr front_insert_iterator<Container> &(since C++ 20) operator=(typename Container::value_type &&value); Inserts the given value value to…
std::front_insert_iterator<Container>::front_insert_iterator – std::front_insert_iterator<Container>::front_insert_iterator Synopsis constexpr front_insert_iterator() noexcept = default; (1) (since C++20) explicit front_insert_iterator( Container& c ); (2) (until C++20) constexpr explicit front_insert_iterator( Container& c ); (since C++20) 1) Initializes the underlying pointer to container with nullptr. (since C++20) 2) Initializes the underlying pointer to the container to std::addressof(c). Parameters c – container to initialize…
std::front_insert_iterator – std::front_insert_iterator Synopsis Defined in header<iterator> template <class Container> class front_insert_iterator : public std::iterator<std::output_iterator_tag, (until C++ 17) void, void, void, void> template <class Container> (since C++ 17) class front_insert_iterator; std::front_insert_iterator is an LegacyOutputIterator that prepends elements to a container for which it was constructed. The container’s push_front() member function is called whenever the iterator…
std::from_chars – std::from_chars Synopsis Defined in header<charconv> std::from_chars_result from_chars(const char *first, const char *last, (1)(since C++ 17) /*see below*/ & value, int base = 10); std::from_chars_result from_chars(const char *first, const char *last, float &value, (2)(since C++ 17) std::chars_format fmt = std::chars_format::general); std::from_chars_result from_chars(const char *first, const char *last, double &value, (3)(since C++ 17) std::chars_format fmt…
std::frexp,std::frexpf,std::frexpl – std::frexp,std::frexpf,std::frexpl Synopsis Defined in header <cmath> float frexp ( float arg, int* exp ); float frexpf( float arg, int* exp ); (since C++11) double frexp ( double arg, int* exp ); (1) (2) long double frexp ( long double arg, int* exp ); long double frexpl( long double arg, int* exp ); (3)…
std::freopen – std::freopen Synopsis Defined in header<cstdio> std::FILE *freopen(const char *filename, const char *mode, std::FILE *stream); First, attempts to close the file associated with stream, ignoring any errors. Then, if filename is not null, attempts to open the file specified by filename using mode as if by fopen, and associates that file with the file…
std::free – std::free Synopsis Defined in header<cstdlib> void free(void *ptr); Deallocates the space previously allocated by std::malloc, std::calloc , std::aligned_alloc (since C++17), or std::realloc. If ptr is a null pointer, the function does nothing. The behavior is undefined if the value of ptr does not equal a value returned earlier by std::malloc, std::calloc , std::aligned_alloc…
std::fread – std::fread Synopsis Defined in header<cstdio> std::size_t fread(void *buffer, std::size_t size, std::size_t count, std::FILE *stream); Reads up to count objects into the array buffer from the given input stream stream as if by calling std::fgetc size times for each object, and storing the results, in the order obtained, into the successive positions of buffer,…
std::fputws – std::fputws Synopsis Defined in header<cwchar> int fputws(const wchar_t *str, std::FILE *stream); Writes every wide character from the null-terminated wide string str to the output stream stream, as if by repeatedly executing std::fputwc. The terminating null wide character from str is not written. Parameters str – null-terminated wide string to be written stream –…