std::string_view ends_with() method

od C++20

// (1) Const version only
constexpr bool ends_with( std::basic_string_view<CharT,Traits> sv ) const noexcept;

// (2) Const version only
constexpr bool ends_with( CharT c ) const noexcept;

// (3) Const version only
constexpr bool ends_with( const CharT* s ) const;

Checks if the string view ends with the given suffix, where

• (1) The suffix is a string view.
  Effectively returns size() >= sv.size() && compare(size() - sv.size(), npos, sv) == 0.

• (2) The suffix is a single character.
  Effectively returns !empty() && Traits::eq(back(), c).

• (3) The suffix is a null-terminated character string.
  Effectively returns ends_with(basic_string_view(s)).

Parameters

• s - a string view view which may be a result of implicit conversion from another std::basic_string_view
• c - a single character
• s - a null-terminated character string view

Return value

true if the view ends with the provided suffix, false otherwise.

Complexity

• (1) Linear in the size of sv - O(sv.size()).
• (2) Constant - O(1).
• (3) Linear in the size of s - O(std::strlen(s)).

Notes

Feature testing macro: __cpp_lib_ends_ends_with.

Example

#include <iostream>
#include <string_view>
 
auto main() -> int
{
    using namespace std::literals;
 
    std::cout
        << std::boolalpha
 
        // (1) bool ends_with( basic_string_view sv ) const noexcept;
        << std::string_view("https://cppreference.com").ends_with(".com"sv) << ' ' // true
        << std::string_view("https://cppreference.com").ends_with(".org"sv) << ' ' // false
 
        // (2) bool ends_with( CharT c ) const noexcept;
        << std::string_view("C++20").ends_with('0') << ' ' // true
        << std::string_view("C++20").ends_with('3') << ' ' // false
 
        // (3) bool ends_with( const CharT* s ) const;
        << std::string_view("string_view").ends_with("view") << ' ' // true
        << std::string_view("string_view").ends_with("View") << ' ' // false
        << '\n';
}

Output

true false true false true false