std::basic_string_view<CharT,Traits>::contains - cppreference.com (original) (raw)
| 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
the substring is a string view.
the substring is a single character.
the substring is a null-terminated character string.
All three overloads are equivalent to return find(x) != npos;, where x is the parameter.
[edit] Parameters
| sv | - | a string view |
|---|---|---|
| c | - | a single character |
| s | - | a null-terminated character string |
[edit] Return value
true if the string view contains the provided substring, false otherwise.
[edit] Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
| __cpp_lib_string_contains | 202011L | (C++23) | contains functions |
[edit] Example
#include 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() {}
[edit] See also
| | checks if the string view starts with the given prefix (public member function) [edit] | | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | | checks if the string view ends with the given suffix (public member function) [edit] | | | find characters in the view (public member function) [edit] | | | returns a substring (public member function) [edit] | | | checks if the string contains the given substring or character (public member function of std::basic_string<CharT,Traits,Allocator>) [edit] |