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std::basic_...w::contains(3)  C++ Standard Libary std::basic_...w::contains(3)

NAME
       std::basic_string_view::contains	- std::basic_string_view::contains

Synopsis
	  constexpr  bool contains( basic_string_view sv ) const noexcept; (1)
       (since C++23)
	  constexpr bool contains( CharT c ) const noexcept;		   (2)
       (since C++23)
	  constexpr  bool contains( const CharT* s ) const;		   (3)
       (since C++23)

	  Checks if the	string view contains the given substring, where

	  1) the substring is a	string view.
	  2) the substring is a	single character.
	  3) the substring is a	null-terminated	character string.

	  All three overloads are equivalent to	return find(x) != npos;, where
       x is the
	  parameter.

Parameters
	  sv - a string	view
	  c  - a single	character
	  s  - a null-terminated character string

Return value
	  true if the string view contains the provided	substring, false  oth-
       erwise.

Notes
	     Feature-test macro	     Value    Std	 Feature
	  __cpp_lib_string_contains 202011L (C++23) contains functions

Example
       // Run this code

	#include <string_view>
	using namespace	std::literals;

	static_assert
	(
	    // bool contains(basic_string_view x) const	noexcept;
	    "https://cppreference.com"sv.contains("cpp"sv) == true and
	    "https://cppreference.com"sv.contains("php"sv) == false and

	    // bool contains(CharT x) const noexcept;
	    "C++23"sv.contains('+') == true and
	    "C++23"sv.contains('-') == false and

	    // bool contains(const CharT* x) const;
	    std::string_view("basic_string_view").contains("string")  ==  true
       and
	    std::string_view("basic_string_view").contains("String") ==	false
	);

	int main() {}

See also
	  starts_with checks if	the string view	starts with the	given prefix
	  (C++20)     (public member function)
	  ends_with   checks if	the string view	ends with the given suffix
	  (C++20)     (public member function)
	  find	      find characters in the view
		      (public member function)
	  substr      returns a	substring
		      (public member function)
	  contains    checks if	the string contains  the  given	 substring  or
       character
	  (C++23)	   (public     member	  function     of     std::ba-
       sic_string<CharT,Traits,Allocator>)

http://cppreference.com		  2024.06.10	  std::basic_...w::contains(3)

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