Section 3: library functions
std::random_device::max – std::random_device::max Synopsis static constexpr result_type max(); (since C++11) Returns the maximum value potentially generated by the random-number engine. This value is equal to std::numeric_limits<unsigned int>::max(). Parameters (none) Return value The maximum potentially generated value. Complexity Constant See also min gets the smallest possible value in the output range (public static member function) [static]
std::random_device::entropy – std::random_device::entropy Synopsis double entropy() const noexcept; (since C++ 11) Obtains an estimate of the random number device entropy, which is a floating-point value between 0 and log 2(max()+1) (which is equal to std::numeric_limits<unsigned int>::digits). If the device has n states whose individual probabilities are P 0,…,P n-1, the device entropy S is defined…
std::random_device – std::random_device Synopsis Defined in header <random> class random_device; (since C++11) std::random_device is a uniformly-distributed integer random number generator that produces non-deterministic random numbers. std::random_device may be implemented in terms of an implementation-defined pseudo-random number engine if a non-deterministic source (e.g. a hardware device) is not available to the implementation. In this case each…
std::random_access_iterator_tag – Synopsis Inherits std::bidirectional_iterator_tag. Detailed Description Random-access iterators support a superset of bidirectional iterator operations. Definition at line 103 of file stl_iterator_base_types.h. Author Generated automatically by Doxygen for libstdc++ from the source code.
std::rand – std::rand Synopsis Defined in header<cstdlib> int rand(); Returns a pseudo-random integral value between 0 and RAND_MAX (0 and RAND_MAX included). std::srand() seeds the pseudo-random number generator used by rand(). If rand() is used before any calls to srand(), rand() behaves as if it was seeded with srand(1). Each time rand() is seeded with…
std::raise – std::raise Synopsis Defined in header<csignal> int raise(int sig); Sends signal sig to the program. The signal handler (specified using the std::signal() function) is invoked. If the user-defined signal handling strategy is not set using std::signal() yet, it is implementation-defined whether the signal will be ignored or default handler will be invoked. Parameters the…
std::quoted – std::quoted Synopsis Defined in header<iomanip> template <class CharT> /*unspecified*/ quoted(const CharT *s, (1)(since C++ 14) CharT delim = CharT(‘"’), CharT escape = CharT(‘\’)); template <class CharT, class Traits, class Allocator> /*unspecified*/ quoted(const std::basic_string<CharT, Traits, Allocator> &s, (2)(since C++ 14) CharT delim = CharT(‘"’), CharT escape = CharT(‘\’)); template <class CharT, class Traits> /*unspecified*/…
std::quick_exit – std::quick_exit Synopsis Defined in header <cstdlib> [[noreturn]] void quick_exit( int exit_code ) noexcept; (since C++11) Causes normal program termination to occur without completely cleaning the resources. Functions passed to std::at_quick_exit are called in reverse order of their registration. If an exception tries to propagate out of any of the functions, std::terminate is called….
std::queue<T,Container>::~queue – std::queue<T,Container>::~queue Synopsis ~queue(); Destructs the container adaptor. The destructors of the elements are called and the used storage is deallocated. Note, that if the elements are pointers, the pointed-to objects are not destroyed. Complexity Linear in the size of the container adaptor.
std::qsort – std::qsort Synopsis Defined in header<cstdlib> void qsort(void *ptr, std::size_t count, std::size_t size, /*compare-pred*/ *comp); (1) void qsort(void *ptr, std::size_t count, std::size_t size, /*c-compare-pred*/ *comp); extern "C++" using /*compare-pred*/ = int(const void *, const void *); // exposition-only (2) extern "C" using /*c-compare-pred*/ = int(const void *, const void *); // exposition-only Sorts the…
std::putwchar – std::putwchar Synopsis Defined in header <cwchar> wint_t putwchar( wchar_t ch ); Writes a wide character ch to stdout Parameters ch – wide character to be written Return value ch on success, WEOF on failure. See also writes a character to stdout putchar (function) writes a wide character to a file stream fputwc (function)…
std::puts – std::puts Synopsis Defined in header<cstdio> int puts(const char *str); Writes every character from the null-terminated string str and one additional newline character ‘\n’ to the output stream stdout, as if by repeatedly executing std::fputc. The terminating null character from str is not written. Parameters str – character string to be written Return value…
std::putchar – std::putchar Synopsis Defined in header<cstdio> int putchar(int ch); Writes a character ch to stdout. Internally, the character is converted to unsigned char just before being written. Equivalent to putc(ch, stdout). Parameters ch – character to be written Return value On success, returns the written character. On failure, returns EOF and sets the error…
std::put_time – std::put_time Synopsis Defined in header<iomanip> template <class CharT> (since C++ 11) /*unspecified*/ put_time(const std::tm *tmb, const CharT *fmt); When used in an expression out << put_time(tmb, fmt), converts the date and time information from a given calendar time tmb to a character string according to format string fmt, as if by calling std::strftime,…
std::put_money – std::put_money Synopsis Defined in header<iomanip> template <class MoneyT> (since C++ 11) /*unspecified*/ put_money(const MoneyT &mon, bool intl = false); When used in an expression out << put_money(mon, intl), converts the monetary value mon to its character representation as specified by the std::money_put facet of the locale currently imbued in out. The insertion operation…
std::push_heap – std::push_heap Synopsis Defined in header<algorithm> template <class RandomIt> (until C++ 20) void push_heap(RandomIt first, RandomIt last); template <class RandomIt> (since C++ 20) constexpr void push_heap(RandomIt first, RandomIt last); template <class RandomIt, class Compare> (1) void push_heap(RandomIt first, RandomIt last, (until C++ 20) Compare comp); (2) template <class RandomIt, class Compare> constexpr void push_heap(RandomIt…
std::ptrdiff_t – std::ptrdiff_t Synopsis Defined in header <cstddef> typedef /*implementation-defined*/ ptrdiff_t; std::ptrdiff_t is the signed integer type of the result of subtracting two pointers. Notes std::ptrdiff_t is used for pointer_arithmetic and array indexing, if negative values are possible. Programs that use other types, such as int, may fail on, e.g. 64-bit systems when the index…
std::ptr_fun – std::ptr_fun Synopsis Defined in header <functional> template< class Arg, class Result > (deprecated in C++11) std::pointer_to_unary_function<Arg,Result> (1) (removed in C++17) ptr_fun( Result (*f)(Arg) ); template< class Arg1, class Arg2, class Result > (deprecated in C++11) std::pointer_to_binary_function<Arg1,Arg2,Result> (2) (removed in C++17) ptr_fun( Result (*f)(Arg1, Arg2) ); Creates a function wrapper object (either std::pointer_to_unary_function or…
std::promise<R>::swap – std::promise<R>::swap Synopsis void swap(promise &other) noexcept; (since C++ 11) Exchanges the shared states of two promise objects. Parameters other – the promise to swap with Return value (none) Example This section is incomplete Reason: no example See also std::swap(std::promise) specializes the std::swap algorithm (function template) (C++11)
std::promise<R>::set_value_at_thread_exit – std::promise<R>::set_value_at_thread_exit Synopsis void set_value_at_thread_exit(const R &value); (1)(member only of generic promise template)(since C++ 11) void set_value_at_thread_exit(R &&value); (2)(member only of generic promise template)(since C++ 11) void set_value_at_thread_exit(R &value); (3)(member only of promise<R &> template specialization)(since C++ 11) void set_value_at_thread_exit()(4)(member only of promise<void> template specialization)(since C++ 11) Stores the value into the shared state…