Section 3: library functions
std::ellint_1,std::ellint_1f,std::ellint_1l – std::ellint_1,std::ellint_1f,std::ellint_1l Synopsis double ellint_1( double k, double φ ); float ellint_1f( float k, float φ ); (1) (since C++17) long double ellint_1l( long double k, long double φ ); Promoted ellint_1( Arithmetic k, Arithmetic φ ); (2) (since C++17) 1) Computes the incomplete_elliptic_integral_of_the_first_kind of k and φ. 2) A set of overloads or…
std::dynamic_extent – std::dynamic_extent Synopsis Defined in header <span> inline constexpr std::size_t dynamic_extent = std::numeric_limits<std::size_t>::max(); (since C++20) std::dynamic_extent is a constant of type std::size_t that is used to differentiate std::span of static and dynamic extent. Note Since std::size_t is an unsigned type, an equivalent definition is: inline constexpr std::size_t dynamic_extent = -1; See integral_conversions. See also…
std::domain_error – std::domain_error Synopsis Defined in header <stdexcept> class domain_error; Defines a type of object to be thrown as exception. It may be used by the implementation to report domain errors, that is, situations where the inputs are outside of the domain on which an operation is defined. The standard library components do not throw…
std::divides<void> – std::divides<void> Synopsis Defined in header<functional> template <> (since C++ 14) class divides<void>; std::divides<> is a specialization of std::divides with parameter and return type deduced. Member types Member type Definition is_transparent /* unspecified */ Member functions returns the quotient of two arguments operator() (public member function) std::divides<>::operator() template< class T, class U> constexpr auto…
std::div,std::ldiv,std::lldiv – std::div,std::ldiv,std::lldiv Synopsis Defined in header <cstdlib> std::div_t div( int x, int y ); (1) std::ldiv_t div( long x, long y ); (2) std::lldiv_t div( long long x, long long y ); (3) (since C++11) std::ldiv_t ldiv( long x, long y ); (4) std::lldiv_t lldiv( long long x, long long y ); (5) (since…
std::distance – std::distance Synopsis Defined in header <iterator> template< class InputIt > typename std::iterator_traits<InputIt>::difference_type (until C++17) distance( InputIt first, InputIt last ); template< class InputIt > constexpr typename std::iterator_traits<InputIt>::difference_type (since C++17) distance( InputIt first, InputIt last ); Returns the number of hops from first to last. The behavior is undefined if last is not reachable…
std::disjunction – std::disjunction Synopsis Defined in header<type_traits> template <class… B> (1)(since C++ 17) struct disjunction; Forms the logical_disjunction of the type traits B…, effectively performing a logical OR on the sequence of traits. The specialization std::disjunction<B1, …, BN> has a public and unambiguous base that is * if sizeof…(B) == 0, std::false_type; otherwise * the…
std::discrete_distribution< _IntType >::param_type – Synopsis Public Types typedef discrete_distribution < _IntType > distribution_type" Public Member Functions template<typename _InputIterator > param_type (_InputIterator __wbegin, _InputIterator __wend) param_type (initializer_list< double > __wil) template<typename _Func > param_type (size_t __nw, double __xmin, double __xmax, _Func __fw) param_type (const param_type &)=default param_type & operator= (const param_type &)=default std::vector< double > probabilities…
std::discrete_distribution<IntType>::reset – std::discrete_distribution<IntType>::reset Synopsis void reset(); (since C++ 11) Resets the internal state of the distribution object. After a call to this function, the next call to operator() on the distribution object will not be dependent on previous calls to operator(). Parameters (none) Return value (none) Complexity Constant.
std::discrete_distribution<IntType>::probabilities – std::discrete_distribution<IntType>::probabilities Synopsis std::vector<double> probabilities() const; (since C++11) Obtains a std::vector<double> containing the individual probabilities of each integer that is generated by this distribution. Parameters (none) Return value An object of type std::vector<double> Example // Run this code #include <iostream> #include <vector> #include <random> int main() { std::discrete_distribution<> d({40, 10, 10, 40}); std::vector<double> p…
std::discrete_distribution<IntType>::param – std::discrete_distribution<IntType>::param Synopsis param_type param() const; (1) (since C++11) void param( const param_type& params ); (2) (since C++11) Manages the associated distribution parameter set. 1) Returns the associated parameter set. 2) Sets the associated parameter set to params Parameters params – new contents of the associated parameter set Return value 1) The associated parameter…
std::discrete_distribution<IntType>::operator() – std::discrete_distribution<IntType>::operator() Synopsis template <class Generator> (1)(since C++ 11) result_type operator()(Generator &g); template <class Generator> (2)(since C++ 11) result_type operator()(Generator &g, const param_type ¶ms); Generates random numbers that are distributed according to the associated probability function. The entropy is acquired by calling g.operator(). The first version uses the associated parameter set, the second version…
std::discrete_distribution<IntType>::min – std::discrete_distribution<IntType>::min Synopsis result_type min() const; (since C++11) Returns the minimum value potentially generated by the distribution. Parameters (none) Return value The minimum value potentially generated by the distribution Complexity Constant. See also returns the maximum potentially generated value max (public member function)
std::discrete_distribution<IntType>::max – std::discrete_distribution<IntType>::max Synopsis result_type max() const; (since C++11) Returns the maximum value potentially generated by the distribution. Parameters (none) Return value The maximum value potentially generated by the distribution. Complexity Constant. See also returns the minimum potentially generated value min (public member function)
std::discrete_distribution<IntType>::discrete_distribution – std::discrete_distribution<IntType>::discrete_distribution Synopsis discrete_distribution(); (1) (since C++11) template< class InputIt > (2) (since C++11) discrete_distribution( InputIt first, InputIt last ); discrete_distribution( std::initializer_list<double> weights ); (3) (since C++11) template< class UnaryOperation > discrete_distribution( std::size_t count, double xmin, double xmax, (4) (since C++11) UnaryOperation unary_op ); explicit discrete_distribution( const param_type& params ); (5) (since C++11) Constructs…
std::discrete_distribution – std::discrete_distribution Synopsis Defined in header<random> template <class IntType = int> (since C++ 11) class discrete_distribution; std::discrete_distribution produces random integers on the interval [0, n), where the probability of each individual integer i is defined as w i/S, that is the weight of the ith integer divided by the sum of all n weights….
std::discard_block_engine<Engine,P,R>::seed – std::discard_block_engine<Engine,P,R>::seed Synopsis void seed(); (1)(since C++ 11) void seed(result_type value); (2)(since C++ 11) template <class Sseq> (3)(since C++ 11) void seed(Sseq &seq); Reinitializes the internal state of the underlying engine using a new seed value. 1) Seeds the underlying engine with the default seed value. Effectively calls e.seed(), where e is the underlying…
std::difftime – std::difftime Synopsis Defined in header <ctime> double difftime( std::time_t time_end, std::time_t time_beg ); Computes difference between two calendar times as std::time_t objects (time_end – time_beg) in seconds. If time_end refers to time point before time_beg then the result is negative. Parameters time_beg, time_end – times to compare Return value Difference between two times…
std::destroying_delete_t,std::destroying_delete – std::destroying_delete_t,std::destroying_delete Synopsis Defined in header<new> struct destroying_delete_t { explicit destroying_delete_t() = default; }; (since C++ 20) inline constexpr destroying_delete_t destroying_delete{}; (since C++ 20) Tag type used to identify the destroying delete form of operator_delete. See also deallocation functions operator_delete (function) operator_delete[]
std::destroy_n – std::destroy_n Synopsis Defined in header <memory> template< class ForwardIt, class Size > (1) (since C++17) ForwardIt destroy_n( ForwardIt first, Size n ); template< class ExecutionPolicy, class ForwardIt, class Size > (2) (since C++17) ForwardIt destroy_n( ExecutionPolicy&& policy, ForwardIt first, Size n ); 1) Destroys the n objects in the range starting at first,…