From cppreference.com
Defined in header
constwchar_t*wmemchr(constwchar_t*ptr,wchar_tch,std::size_tcount); (1) wchar_t*wmemchr(wchar_t*ptr,wchar_tch,std::size_tcount); (2) Locates the first occurrence of wide character ch in the initial count wide characters of the wide character array pointed to by ptr.
If count is zero, the function returns a null pointer.
Parameters
ptr - pointer to the wide character array to be examined ch - wide character to search for count - number of wide characters to examine Return value
Pointer to the location of the wide character, or a null pointer if no such character is found.
Example
Run this code
#include<clocale>#include<cwchar>#include<iostream>#include<locale>intmain(){constwchar_tstr[]=L"诺不轻信，故人不负我\0诺不轻许，故我不负人。";wchar_ttarget=L'许';conststd::size_tsz=sizeofstr/sizeof*str;if(constwchar_t*result=std::wmemchr(str,target,sz)){std::setlocale(LC_ALL,"en_US.utf8");std::wcout.imbue(std::locale("en_US.utf8"));std::wcout<<"Found '"<<target<<"' at position "<<result-str<<'\n';}}Possible output:
Found '许' at position 14 See also
searches an array for the first occurrence of a character
(function)
finds the first occurrence of a character
(function)
finds the first occurrence of a wide character in a wide string
(function)
(C++11)
finds the first element satisfying specific criteria
(function template & algorithm function object)
ranges::findranges::find_ifranges::find_if_not
(C++20)(C++20)(C++20)
for wmemchr