Linux Manuals

std::iter_value_t,std::iter_reference_t,std::iter_difference_t, – std::iter_value_t,std::iter_reference_t,std::iter_difference_t, Synopsis Defined in header <iterator> template< class T > concept /*dereferenceable*/ = /* see below */; // exposition only template< class T > (1) (since using iter_value_t = /* see below */; C++20) template< /*dereferenceable*/ T > (2) (since using iter_reference_t = decltype(*std::declval<T&>()); C++20) template< class T > (3) (since using iter_difference_t…

std::iter_swap – std::iter_swap Synopsis Defined in header<algorithm> template <class ForwardIt1, class ForwardIt2> (until C++ 20) void iter_swap(ForwardIt1 a, ForwardIt2 b); template <class ForwardIt1, class ForwardIt2> (since C++ 20) constexpr void iter_swap(ForwardIt1 a, ForwardIt2 b); Swaps the values of the elements the given iterators are pointing to. Parameters a, b – iterators to the elements to…

std::isxdigit – std::isxdigit Synopsis Defined in header<cctype> int isxdigit(int ch); Checks if the given character is a hexadecimal numeric character (0123456789abcdefABCDEF). The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF. Parameters ch – character to classify Return value Non-zero value if the character…

std::isxdigit(std::locale) – std::isxdigit(std::locale) Synopsis Defined in header<locale> template <class charT> bool isxdigit(charT ch, const locale &loc); Checks if the given character is classified as a hexadecimal digit by the given locale’s std::ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as a hexadecimal digit, false otherwise….

std::iswxdigit – std::iswxdigit Synopsis Defined in header<cwctype> int iswxdigit(wint_t ch); Checks if the given wide character corresponds (if narrowed) to a hexadecimal numeric character, i.e. one of 0123456789abcdefABCDEF. If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined. Parameters ch –…

std::iswupper – std::iswupper Synopsis Defined in header<cwctype> int iswupper(std::wint_t ch); Checks if the given wide character is an uppercase letter, i.e. one of ABCDEFGHIJKLMNOPQRSTUVWXYZ or any uppercase letter specific to the current locale. If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior…

std::iswspace – std::iswspace Synopsis Defined in header<cwctype> int iswspace(wint_t ch); Checks if the given wide character is a wide whitespace character as classified by the currently installed C locale. In the default locale, the whitespace characters are the following: * space (0x20, ‘ ‘) * form feed (0x0c, ‘\f’) * line feed (0x0a, ‘\n’) *…

std::iswpunct – std::iswpunct Synopsis Defined in header<cwctype> int iswpunct(std::wint_t ch); Checks if the given wide character is a punctuation character, i.e. it is one of !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~ or any punctuation character specific to the current locale. If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF,…

std::iswprint – std::iswprint Synopsis Defined in header<cwctype> int iswprint(std::wint_t ch); Checks if the given wide character can be printed, i.e. it is either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz), a punctuation character(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~), space or any printable character specific to the current C locale. If the value of ch is neither…

std::iswlower – std::iswlower Synopsis 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. If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior…

std::iswgraph – std::iswgraph Synopsis Defined in header<cwctype> int iswgraph(std::wint_t ch); Checks if the given wide character has a graphical representation, i.e. it is either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz), a punctuation character(!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~) or any graphical character specific to the current C locale. If the value of ch is neither…

std::iswdigit – std::iswdigit Synopsis Defined in header<cwctype> int iswdigit(wint_t ch); Checks if the given wide character corresponds (if narrowed) to one of the ten decimal digit characters 0123456789. If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined. Parameters ch –…

std::iswctype – std::iswctype Synopsis Defined in header<cwctype> int iswctype(std::wint_t wc, std::wctype_t desc); Classifies the wide character wc using the current C locale’s LC_CTYPE category identified by desc. If the value of wc is neither representable as a wchar_t nor equal to the value of the macro WEOF, the behavior is undefined. Parameters wc – the…

std::iswcntrl – std::iswcntrl Synopsis Defined in header<cwctype> int iswcntrl(std::wint_t ch); Checks if the given wide character is a control character, i.e. codes 0x00-0x1F and 0x7F and any control characters specific to the current locale. If the value of ch is neither representable as a wchar_t nor equal to the value of the macro WEOF, the…

std::iswblank – std::iswblank Synopsis Defined in header <cwctype> int iswblank( std::wint_t ch ); (since C++11) Checks if the given wide character is classified as blank character (that is, a whitespace character used to separate words in a sentence) by the current C locale. In the default C locale, only space (0x20) and horizontal tab (0x09)…

std::iswalpha – std::iswalpha Synopsis Defined in header<cwctype> int iswalpha(std::wint_t ch); Checks if the given wide character is an alphabetic character, i.e. either an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz) or any alphabetic character specific to the current locale. If the value of ch is neither representable as a wchar_t nor equal to the value…

std::iswalnum – std::iswalnum Synopsis Defined in header<cwctype> int iswalnum(std::wint_t ch); Checks if the given wide character is an alphanumeric character, i.e. either a number (0123456789), an uppercase letter (ABCDEFGHIJKLMNOPQRSTUVWXYZ), a lowercase letter (abcdefghijklmnopqrstuvwxyz) or any alphanumeric character specific to the current locale. If the value of ch is neither representable as a wchar_t nor equal…

std::isupper – std::isupper Synopsis Defined in header<cctype> int isupper(int ch); Checks if the given character is an uppercase character as classified by the currently installed C locale. In the default "C" locale, isupper returns a nonzero value only for the uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ). If isupper returns a nonzero value, it is guaranteed that iscntrl, isdigit,…

std::isupper(std::locale) – std::isupper(std::locale) Synopsis Defined in header<locale> template <class charT> bool isupper(charT ch, const locale &loc); Checks if the given character is classified as an uppercase alphabetic character by the given locale’s std::ctype facet. Parameters ch – character loc – locale Return value Returns true if the character is classified as uppercase, false otherwise. Possible…

std::isunordered – std::isunordered Synopsis Defined in header <cmath> bool isunordered( float x, float y ); (1) (since C++11) bool isunordered( double x, double y ); (2) (since C++11) bool isunordered( long double x, long double y ); (3) (since C++11) bool isunordered( Arithmetic x, Arithmetic y ); (4) (since C++11) 1-3) Determines if the floating…