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std::source_location::source_location

From cppreference.com
 
 
Utilities library
General utilities
Date and time
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Formatting library (C++20)
(C++11)
Relational operators (deprecated in C++20)
Integer comparison functions
(C++20)(C++20)(C++20)   
(C++20)
Swap and type operations
(C++14)
(C++11)

(C++11)
(C++11)
(C++17)
Common vocabulary types
(C++11)
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(C++17)
(C++23)
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(C++17)

Elementary string conversions
(C++17)
(C++17)
 
 
constexpr source_location() noexcept;
(1) (since C++20)
source_location( const source_location& other );
(2) (since C++20)
source_location( source_location&& other ) noexcept;
(3) (since C++20)
1) Constructs a source_location object of unspecified value.
2-3) Copy and move constructors. It is unspecified whether they are trivial and/or constexpr.

[edit] Parameters

other - another source_location to copy or move from

[edit] Example

#include <iomanip>
#include <iostream>
#include <ranges>
#include <vector>
#include <source_location>
#include <string_view>
 
// GCC specific type name printer
#if (__GNUG__ >= 11)
template <typename T>
auto type_name_helper(const std::source_location s = std::source_location::current()) {
    using std::operator""sv;
    const std::string_view fun_name{s.function_name()};
    constexpr auto prefix {"[with T = "sv};
    const auto type_name_begin {fun_name.find(prefix)};
    if (""sv.npos == type_name_begin) return ""sv;
    const std::size_t first {type_name_begin + prefix.length()};
    return std::string_view{fun_name.cbegin() + first, fun_name.cend() - 1};
}
template <typename T>
auto type_name() { return type_name_helper<T>(); }
#endif
 
 
void print(std::string_view const comment, std::source_location const l) {
    std::cout
        << comment << ":\n"
        << "  file_name     : " << std::quoted(l.file_name()) << '\n'
        << "  function_name : " << std::quoted(l.function_name()) << '\n'
        << "  line          : " << l.line() << '\n'
        << "  column        : " << l.column() << '\n';
}
 
int main()
{
    constexpr std::source_location default_constructed;
    print("default constructed", default_constructed);
 
    constexpr std::source_location current = std::source_location::current();
    print("current", current);
 
#   if (__GNUG__ >= 11)
    const std::vector<std::vector<int>> v{ {1,2}, {3,4,5}, {6} };
    auto jv = std::ranges::join_view(v);
    std::cout
        << '\n'
        << '[' << type_name<int>() << "]\n"
        << '[' << type_name<double*>() << "]\n"
        << '[' << type_name<decltype([](){})>() << "]\n"
        << '[' << type_name<decltype(type_name<int>())>() << "]\n"
        << '[' << type_name<decltype(jv)>() << "]\n"
        ;
#   endif
}

Possible output:

default constructed:
  file_name     : ""
  function_name : ""
  line          : 0
  column        : 0
current:
  file_name     : "main.cpp"
  function_name : "int main()"
  line          : 39
  column        : 75
 
[int]
[double*]
[main()::<lambda()>]
[std::basic_string_view<char>]
[std::ranges::join_view<std::ranges::ref_view<const std::vector<std::vector<int> > > >]

[edit] See also

[static]
constructs a new source_location corresponding to the location of the call site
(public static member function) [edit]
constructs a new stacktrace_entry
(public member function of std::stacktrace_entry) [edit]