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std::source_location::line(3) C++ Standard Libarystd::source_location::line(3) NAME std::source_location::line - std::source_location::line Synopsis constexpr std::uint_least32_t line() const noexcept; (since C++20) Returns the line number represented by this object. Parameters (none) Return value The line number represented by this object. An implementation is encouraged to return 0 when the line number is unknown. Example // Run this code #include <iostream> #include <string_view> #include <source_location> inline void cur_line( const std::string_view message = "", const std::source_location& location = std::source_location::cur- rent()) { std::cout << location.line() // <- the line # of a call site << ") " << message; } int main() { cur_line("++\n"); cur_line(); std::cout << "Hello,\n"; cur_line(); std::cout << "C++20!\n"; cur_line("--\n"); } Output: 17) ++ 18) Hello, 19) C++20! 20) -- See also column return the column number represented by this object (public member function) file_name return the file name represented by this object (public member function) function_name return the name of the function represented by this object, if any (public member function) source_line gets the line number that lexically relates the evalu- ation represented (C++23) by the stacktrace_entry (public member function of std::stacktrace_entry) Filename and line information http://cppreference.com 2022.07.31 std::source_location::line(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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