SourceLocation.hpp

#pragma once
 
#if defined(HAS_SOURCE_LOCATION) && __has_builtin(__builtin_source_location)
// this is used by fully compatible compilers like gcc
#include <source_location>
 
#elif defined(HAS_EXPERIMENTAL_SOURCE_LOCATION)
// this is used by clang on linux where source_location is still not out of
// experimental headers
#include <experimental/source_location>
 
#else
 
#include <cstddef>
#include <string_view>
#endif
 
namespace util {
 
#if defined(HAS_SOURCE_LOCATION) && __has_builtin(__builtin_source_location)
using SourceLocationType = std::source_location;
 
#elif defined(HAS_EXPERIMENTAL_SOURCE_LOCATION)
using SourceLocationType = std::experimental::source_location;
 
#else
class SourceLocation {
    char const* file_;
    std::size_t line_;
 
public:
    constexpr SourceLocation(char const* file, std::size_t line) : file_{file}, line_{line}
    {
    }

    constexpr std::string_view
    file_name() const
    {
        return file_;
    }

    constexpr std::size_t
    line() const
    {
        return line_;
    }
};
using SourceLocationType = SourceLocation;
#define SOURCE_LOCATION_OLD_API
 
#endif
 
}  // namespace util
 
#if defined(SOURCE_LOCATION_OLD_API)
#define CURRENT_SRC_LOCATION util::SourceLocationType(__FILE__, __LINE__)
#else
#define CURRENT_SRC_LOCATION util::SourceLocationType::current()
#endif