Defined in header <cmath> float atanh( float arg ); (1) (since C++11) double atanh( double arg ); (2) (since C++11) long double atanh( long double arg ); (3) (since C++11) double atanh( Integral arg ); (4) (since C++11) Computes the inverse hyperbolic tangent 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

long& iword( int index ); First, allocates or resizes the private storage (dynamic array of long or another indexable data structure) sufficiently to make index a valid index, then returns a reference to the long element of the private storage with the index index. The reference may be invalidated by any operation on this ios_base object, including another call to iword(), but the stored values are retained, so that reading from iword(index) with the same index later will produce th

Defined in header <locale> public: int compare( const CharT* low1, const CharT* high1, const CharT* low2, const CharT* high2 ) const; (1) protected: virtual int do_compare( const CharT* low1, const CharT* high1, const CharT* low2, const CharT* high2 ) const; (2) 1) Public member function, calls the protected virtual member function do_compare of the most derived class. 2) Compares the character sequence [low1, high1) to the chara

The floating-point environment is the set of floating-point status flags and control modes supported by the implementation. It is thread-local, each thread inherits the initial state of its floating-point environment from the parent thread. Floating-point operations modify the floating-point status flags to indicate abnormal results or auxiliary information. The state of floating-point control modes affects the outcomes of some floating-point operations. The floating-point environment access an

Usage automatic storage duration specifier (deprecated). (until C++17) The keyword is unused and reserved. (since C++17)

std::basic_string<CharT, Traits, Allocator> str() const; (1) void str( const std::basic_string<CharT, Traits, Allocator>& s); (2) Gets and sets the underlying string. 1) Creates and returns a std::basic_string object containing a copy of this std::basic_stringbuf's underlying character sequence. For input-only streams, the returned string contains the characters from the range [eback(), egptr()). For input/output or output-only streams, contains the characters fro

static std::time_t to_time_t( const time_point& t ); (since C++11) Converts t to a std::time_t type. If std::time_t has lower precision, it is implementation-defined whether the value is rounded or truncated. Parameters t - system clock time point to convert Return value A std::time_t value representing t. Exceptions noexcept specification: noexcept See also from_time_t [static] converts std::time_t to a system clock time point (public static member funct

Usage alternative operators: as an alternative for |=

For an unqualified name, that is a name that does not appear to the right of a scope resolution operator ::, name lookup examines the scopes as described below, until it finds at least one declaration of any kind, at which time the lookup stops and no further scopes are examined. (Note: lookup from some contexts skips some declarations, for example, lookup of the name used to the left of :: ignores function, variable, and enumerator declarations, lookup of a name used as a base class specifier

void freeze(bool flag = true); If the stream is using a dynamically-allocated array for output, disables (flag == true) or enables (flag == false) automatic allocation/deallocation of the buffer. Effectively calls rdbuf()->freeze(flag). Notes After a call to str(), dynamic streams become frozen automatically. A call to freeze(false) is required before exiting the scope in which this ostrstream object was created. otherwise the destructor will leak memory. Also, additional output t