Defined in header <cmath> float acos( float arg ); (1) double acos( double arg ); (2) long double acos( long double arg ); (3) double acos( Integral arg ); (4) (since C++11) Computes the principal value of the arc cosine of arg. 4) A set of overloads or a function template accepting an argument of any integral type. Equivalent to 2) (the argument is cast to double). Parameters arg - value of a floating-point or Integral type R

Defined in header <locale> template< class InternT, class ExternT, class State > class codecvt_byname : public std::codecvt<InternT, ExternT, State>; std::codecvt_byname is a std::codecvt facet which encapsulates multibyte/wide character conversion rules of a locale specified at its construction. Four specializations are provided by the standard library. Defined in header <locale> std::codecvt_byname<char, char, std::mbstate_t> identity convers

Template declarations (class, function, and variables (since C++14)) can appear inside a member specification of any class, struct, or union that aren't local classes. #include <iostream> #include <vector> #include <algorithm> struct Printer { // generic functor std::ostream& os; Printer(std::ostream& os) : os(os) {} template<typename T> void operator()(const T& obj) { os << obj << ' '; } // member template }; int main() {

Defined in header <type_traits> template< class T > struct is_pointer; (since C++11) Checks whether T is a pointer to object or a pointer to function (but not a pointer to member/member function). Provides the member constant value which is equal to true, if T is a object/function pointer type. Otherwise, value is equal to false. Template parameters T - a type to check Helper variable template template< class T > constexpr bool is_pointer_v = is

Defined in header <algorithm> template< class ForwardIt > ForwardIt adjacent_find( ForwardIt first, ForwardIt last ); (1) template< class ForwardIt, class BinaryPredicate> ForwardIt adjacent_find( ForwardIt first, ForwardIt last, BinaryPredicate p ); (2) Searches the range [first, last) for two consecutive identical elements. The first version uses operator== to compare the elements, the second version uses the given binary predicate p. Parameters firs

template< class OutputIt > OutputIter format( OutputIt out, const char_type* fmt_first, const char_type* fmt_last, std::regex_constants::match_flag_type flags = std::regex_constants::format_default ) const; (1) (since C++11) template< class OutputIt, class ST, class SA > OutputIter format( OutputIt out, const basic_string<char_type,ST,SA>& fmt, std::regex_constants::ma

template< class Rep, class Period > bool try_lock_for( const std::chrono::duration<Rep,Period>& timeout_duration ); (since C++11) Tries to lock the mutex. Blocks until specified timeout_duration has elapsed or the lock is acquired, whichever comes first. On successful lock acquisition returns true, otherwise returns false. If timeout_duration is less or equal timeout_duration.zero(), the function behaves like try_lock(). A steady clock is used to measure the duration. Th

Defined in header <iterator> template< class CharT, class Traits = std::char_traits<CharT> > class istreambuf_iterator : public std::iterator< std::input_iterator_tag, CharT, typename Traits::off_type, /* unspecified, usually CharT* */, CharT > (until C++17) te

Defined in header <memory> template< class Ptr > struct pointer_traits; (1) (since C++11) template< class T > struct pointer_traits<T*>; (2) (since C++11) The pointer_traits class template provides the standardized way to access certain properties of pointer-like types. The standard template std::allocator_traits relies on pointer_traits to determine the defaults for various typedefs required by Allocator. 1) The non-specialized pointer_traits declar

local_iterator end( size_type n ); (since C++11) const_local_iterator end( size_type n ) const; (since C++11) const_local_iterator cend( size_type n ) const; (since C++11) Returns an iterator to the element following the last element of the bucket with index n. . This element acts as a placeholder, attempting to access it results in undefined behavior. Parameters n - the index of the bucket to access Return value iterator to the element following the last eleme