std::experimental::source_location::line

Returns the line number represented by this object.

# Declarations

constexpr std::uint_least32_t line() const noexcept;

(library fundamentals TS v2)

# Return value

The line number represented by this object.

# Example

#include <experimental/source_location>
#include <iostream>
#include <string_view>
using std::experimental::source_location;
 
inline void cur_line(
    const std::string_view message = "",
    const source_location& location = source_location::current())
{
    std::cout
        << location.line() // <- the call-site line #
        << ") "
        << message; 
}
 
int main()
{
    cur_line("++" "\n");
    cur_line(); std::cout << "Hello," "\n";
    cur_line(); std::cout << "C++20!" "\n";
    cur_line("--" "\n");
}

# See also