Defined in header <cmath> float abs( float arg ); (1) double abs( double arg ); (2) long double abs( long double arg ); (3) double abs( Integral arg ); (4) (since C++11) float fabs( float arg ); (5) double fabs( double arg ); (6) long double fabs( long double arg ); (7) double fabs( Integral arg ); (8) (since C++11) 1-3,5-7) Computes the absolute value of a floating point value arg. 4,8) A set of ov

Defined in header <memory> template< class T > struct allocator; (1) template<> struct allocator<void>; (2) The std::allocator class template is the default Allocator used by all standard library containers if no user-specified allocator is provided. The default allocator is stateless, that is, all instances of the given allocator are interchangeable, compare equal and can deallocate memory allocated by any other instance of the same allocator type.

Defined in header <iomanip> template< class CharT > /*unspecified*/ put_time( const std::tm* tmb, const CharT* fmt ); (since C++11) 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::wcsftime, or analog (depending on CharT), according to the std::time_put facet of the locale currently imbued in the ou

Defined in header <type_traits> template< class T > struct is_pod; (since C++11) If T is a PODType ("plain old data type"), that is, both trivial and standard-layout, provides the member constant value equal true. For any other type, value is false. The behavior is undefined if std::remove_all_extents_t<T> is an incomplete type and not (possibly cv-qualified) void. Template parameters T - a type to check Helper variable template template< cla

Usage declaration of an overloaded operator

Defined in header <algorithm> template< class RandomIt > void push_heap( RandomIt first, RandomIt last ); (1) template< class RandomIt, class Compare > void push_heap( RandomIt first, RandomIt last, Compare comp ); (2) Inserts the element at the position last-1 into the max heap defined by the range [first, last-1). The first version of the function uses operator< to compare the elements, the second uses the given comparison function com

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 <array> template< class T, std::size_t N > struct array; (since C++11) std::array is a container that encapsulates fixed size arrays. This container is an aggregate type with the same semantics as a struct holding a C-style array T[N] as its only non-static data member. Unlike a C-style array, it doesn't decay to T* automatically. As an aggregate type, it can be initialized with aggregate-initialization given at most N initializers that ar

Defined in header <algorithm> template< class RandomIt > void random_shuffle( RandomIt first, RandomIt last ); (1) (until C++17)(deprecated in C++14) (2) template< class RandomIt, class RandomFunc > void random_shuffle( RandomIt first, RandomIt last, RandomFunc& r ); (until C++11) template< class RandomIt, class RandomFunc > void random_shuffle( RandomIt first, RandomIt last, RandomFunc&& r ); (since C++11) (until C++17)(deprecated in

Defined in header <cwctype> int iswlower( std::wint_t ch ); Checks if the given wide character is a lowercase letter, i.e. one of abcdefghijklmnopqrstuvwxyz or any lowercase letter specific to the current locale. Parameters ch - wide character Return value Non-zero value if the wide character is an lowercase letter, zero otherwise. Example #include <iostream> #include <cwctype> #include <clocale> int main() { wchar_t c = L'\u0444';