Skip to content

string-view-hash.md

Latest commit

 

History

History
45 lines (36 loc) · 1.02 KB

string-view-hash.md

File metadata and controls

45 lines (36 loc) · 1.02 KB
description Learn more about: hash<string_view> Specialization
title hash<string_view> Specialization
ms.date 04/19/2019
f1_keywords
xstring/basic_string_view::hash
helpviewer_keywords
std::basic_string_view::hash

hash<string_view> Specialization

A template specialization that produces a hash value given a string_view.

template <class CharType, class Traits>
struct hash<basic_string_view<CharType, Traits>>
{
    typedef basic_string_view<CharType, Traits> argument_type;
    typedef size_t result_type;

    size_t operator()(const basic_string_view<CharType, Traits>) const
        noexcept;
};

Remarks

The hash of a string_view equals the hash of the underlying string object.

Example

//compile with: /std:c++17
#include <string>
#include <string_view>
#include <iostream>

using namespace std;

int main()
{
    string_view sv{ "Hello world" };
    string s{ "Hello world" };
    cout << boolalpha << (hash<string_view>{}(sv)
        == hash<string>{}(s)); // true
}