std::source_location::source_location - cppreference.com (original) (raw)

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

[edit] Example

#include #include #include #include #include #include   // GCC specific type name printer #if (GNUG >= 11) template 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 auto type_name() { return type_name_helper(); } #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> v{{1,2}, {3,4,5}, {6}}; auto jv = std::ranges::join_view(v); std::cout << '\n' << '[' << type_name() << "]\n" << '[' << type_name<double*>() << "]\n" << '[' << type_name<decltype({})>() << "]\n" << '[' << type_name<decltype(type_name())>() << "]\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] [std::ranges::join_view<std::ranges::ref_view<const std::vector<std::vector > > >]

[edit] See also

| | 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] |