std::source_location::line
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
#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::current())
{
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
| return the column number represented by this object (public member function) |
|
| return the file name represented by this object (public member function) |
|
| return the name of the function represented by this object, if any (public member function) |
|
gets the line number that lexically relates the evaluation represented by the stacktrace_entry (public member function of std::stacktrace_entry) |
|
| Filename and line information | |
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https://en.cppreference.com/cpp/utility/source_location/line
