std::source_location::line
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< cpp | utility | source location
C++
Utilities library
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std::source_location
| Member functions | ||||
| Creation | ||||
| Field access | ||||
source_location::line | ||||
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constexpr
std::uint_least32_t line(
)
const
noexcept
;
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(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::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) |
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| return the file name represented by this object (public member function) |
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| return the name of the function represented by this object, if any (public member function) |
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gets the line number that lexically relates the evaluation represented by the stacktrace_entry (public member function of std::stacktrace_entry) |
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| Filename and line information | |