std::basic_string_view::size, std::basic_string_view::length

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std::basic_string_view::size, std::basic_string_view::length

constexpr size_type size() const noexcept;
(since C++17)
constexpr size_type length() const noexcept;
(since C++17)

Returns the number of CharT elements in the view, i.e. std::distance(begin(), end()).



Return value

The number of CharT elements in the view.




#include <string_view>
#include <iostream>
void check_string(std::string_view ref)
        // Print a string surrounded by single quotes, its length
        // and whether it is considered empty.
        std::cout << std::boolalpha
                  << "'" << ref << "' has " << ref.size()
                  << " character(s); emptiness: " << ref.empty() << '\n';
int main(int argc, char **argv)
        // An empty string
        // Almost always not empty: argv[0]
        if (argc > 0)

Possible output:

'' has 0 character(s); emptiness: true
'./a.out' has 7 character(s); emptiness: false

See also

checks whether the view is empty

(public member function)

returns the maximum number of characters

(public member function)

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