std::source_location

#include <source_location>
#include <iostream>
#include <string_view>
// Logging with automatic location
void log(std::string_view message,
         const std::source_location& loc = std::source_location::current()) {
    std::cout << loc.file_name() << ":"
              << loc.line() << " ["
              << loc.function_name() << "] "
              << message << std::endl;
}
// Assert with location info
void my_assert(bool condition, std::string_view msg,
               const std::source_location& loc = std::source_location::current()) {
    if (!condition) {
        std::cerr << "Assertion failed: " << msg << "\n"
                  << "  at " << loc.file_name() << ":" << loc.line() << "\n"
                  << "  in " << loc.function_name() << std::endl;
    }
}
void do_something() {
    log("Processing started");
    // ... work ...
    log("Processing complete");
}
int main() {
    log("Application starting");
    
    do_something();
    
    int value = 42;
    my_assert(value > 0, "value must be positive");
    my_assert(value < 10, "value must be less than 10");  // Fails
    
    return 0;
}
/* Output:
main.cpp:30 [main] Application starting
main.cpp:17 [do_something] Processing started
main.cpp:19 [do_something] Processing complete
Assertion failed: value must be less than 10
  at main.cpp:35
  in main
*/