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Showing content from http://en.cppreference.com/w/cpp/language/attributes/../../string/basic_string_view/size.html below:

std::basic_string_view<CharT,Traits>::size, std::basic_string_view<CharT,Traits>::length - cppreference.com

constexpr size_type size() const noexcept;

constexpr size_type length() const noexcept;

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

(none)

The number of CharT elements in the view.

Constant.

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

Possible output:

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

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