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std::char_traits::find(3)     C++ Standard Libary    std::char_traits::find(3)

NAME
       std::char_traits::find -	std::char_traits::find

Synopsis
	  static const char_type* find(	const char_type* p, std::size_t	count,
       (until C++17)
	  const	char_type& ch );
	  static   constexpr   const  char_type*  find(	 const	char_type*  p,
       (since C++17)
	  std::size_t count, const char_type& ch );

	  Searches for character ch within the first count characters  of  the
       sequence	pointed
	  to by	p.

Parameters
	  p	- pointer to a character string	to search
	  count	- the number of	characters to analyze
	  ch	- the character	to search for

Return value
	  A  pointer  to the first character in	the range specified by [p, p +
       count) that
	  compares equal to ch,	or a null pointer if not found.

Exceptions
	  Throws nothing.

Complexity
	  Linear in count.

http://cppreference.com		  2022.07.31	     std::char_traits::find(3)

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