std::basic_string_view::size, std::basic_string_view::length
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std::basic_string_view::size, std::basic_string_view::length
|
(since C++17) | |
|
(since C++17) |
Returns the number of CharT
elements in the view, i.e. std::distance(begin(), end())
.
Parameters
(none).
Return value
The number of CharT
elements in the view.
Complexity
Constant.
Example
#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
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
See also
checks whether the view is empty (public member function) | |
returns the maximum number of characters (public member function) |
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