std::basic_string_view<CharT,Traits>::size, std::basic_string_view<CharT,Traits>::length
From cppreference.com
< cpp | string | basic string view
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()).
Contents |
[edit] Parameters
(none)
[edit] Return value
The number of CharT
elements in the view.
[edit] Complexity
Constant.
[edit] Example
Run this code
#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
[edit] See also
checks whether the view is empty (public member function) | |
returns the maximum number of characters (public member function) | |
returns the number of characters (public member function of std::basic_string<CharT,Traits,Allocator> )
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