libstdc++-v3/testsuite/18_support/source_location/consteval.cc

   1 // Copyright (C) 2020-2023 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // Example from C++ Standard Working Draft N4842, November 2019 Mailing
  19 // Adapted for testing.
  20
  21 // { dg-options "-std=gnu++2a" }
  22 // { dg-do compile { target c++2a } }
  23
  24 #include <source_location>
  25 #include <string_view>
  26
  27 struct s {
  28   std::source_location member = std::source_location::current();
  29   int other_member = 1;
  30
  31   constexpr s(std::source_location loc = std::source_location::current())
  32     : member(loc) // values of member refer to calling function
  33   { }
  34
  35   constexpr s(int blather) : // values of member refer to this location
  36     other_member(blather)
  37   { }
  38 };
  39
  40 constexpr std::source_location
  41 f(std::source_location a = std::source_location::current())
  42 { return a; }
  43
  44 constexpr auto
  45 g()
  46 {
  47   struct srcloc_and_line
  48   {
  49     std::source_location sl;
  50     unsigned line;
  51   };
  52
  53   std::source_location c = std::source_location::current();
  54   return srcloc_and_line{ f(c), __LINE__ - 1 };
  55 }
  56
  57 #include "srcloc.h"
  58
  59 int main ()
  60 {
  61   constexpr std::source_location main_sl = std::source_location::current();
  62   constexpr unsigned main_sl_line = __LINE__ - 1;
  63   constexpr std::source_location f_arg_sl = f(main_sl);
  64   constexpr unsigned f_arg_sl_line = main_sl_line;
  65   constexpr std::source_location g_sl = g().sl;
  66   constexpr unsigned g_sl_line = g().line;
  67   constexpr std::source_location f_sl = f();
  68   constexpr unsigned f_sl_line = __LINE__ - 1;
  69   constexpr std::source_location h_sl = h(); // defined in ./srcloc.h
  70   constexpr s member_main_sl(main_sl);
  71   constexpr s member_defaulted_sl(1);
  72   constexpr s member_sl = s{};
  73   constexpr unsigned member_sl_line = __LINE__ - 1;
  74
  75   using namespace std::string_view_literals;
  76
  77   static_assert (std::source_location::current ().line () == __LINE__);
  78   static_assert (std::source_location::current ().column () == 48);
  79
  80
  81   constexpr std::string_view main_sl_fn_name(main_sl.function_name());
  82   constexpr std::string_view main_sl_fi_name(main_sl.file_name());
  83   static_assert(main_sl.line() == main_sl_line);
  84   // opening paren of call
  85   static_assert(main_sl.column() == 73);
  86   static_assert(main_sl_fn_name.ends_with("main()"sv));
  87   static_assert(main_sl_fi_name.ends_with("consteval.cc"sv));
  88
  89   constexpr std::string_view f_arg_sl_fn_name(f_arg_sl.function_name());
  90   constexpr std::string_view f_arg_sl_fi_name(f_arg_sl.file_name());
  91   static_assert(f_arg_sl.line() == f_arg_sl_line);
  92   // opening paren of call
  93   static_assert(f_arg_sl.column() == 73);
  94   static_assert(f_arg_sl_fn_name.ends_with("main()"sv));
  95   static_assert(f_arg_sl_fi_name.ends_with("consteval.cc"sv));
  96
  97   constexpr std::string_view g_sl_fn_name(g_sl.function_name());
  98   constexpr std::string_view g_sl_fi_name(g_sl.file_name());
  99   static_assert(g_sl.line() == g_sl_line);
 100   static_assert(g_sl.column() == 57); // opening paren of call
 101   static_assert(g_sl_fn_name.ends_with("g()"sv));
 102   static_assert(g_sl_fi_name.ends_with("consteval.cc"sv));
 103
 104   constexpr std::string_view h_sl_fn_name(h_sl.function_name());
 105   constexpr std::string_view h_sl_fi_name(h_sl.file_name());
 106   static_assert(h_sl.line() == 23);
 107   static_assert(h_sl.column() == 57); // opening paren of call
 108   static_assert(h_sl_fn_name.ends_with("h()"sv));
 109   static_assert(h_sl_fi_name.ends_with("srcloc.h"sv));
 110
 111   constexpr std::string_view member_main_sl_fn_name(member_main_sl.member.function_name());
 112   constexpr std::string_view member_main_sl_fi_name(member_main_sl.member.file_name());
 113   static_assert(member_main_sl.member.line() == main_sl_line);
 114   static_assert(member_main_sl.member.column() == 73);
 115   static_assert(member_main_sl_fn_name.ends_with("main()"sv));
 116   static_assert(member_main_sl_fi_name.ends_with("consteval.cc"sv));
 117
 118   constexpr std::string_view member_defaulted_sl_fi_name(
 119     member_defaulted_sl.member.file_name());
 120   constexpr std::string_view member_defaulted_sl_fn_name(
 121     member_defaulted_sl.member.function_name());
 122   static_assert(member_defaulted_sl.member.line() == 36);
 123   // closing paren of constructor declaration
 124   static_assert(member_defaulted_sl.member.column() == 25);
 125   static_assert(member_defaulted_sl_fn_name.ends_with("s::s(int)"sv));
 126   static_assert(member_defaulted_sl_fi_name.ends_with("consteval.cc"sv));
 127
 128   constexpr std::string_view member_sl_fi_name(
 129     member_sl.member.file_name());
 130   constexpr std::string_view member_sl_fn_name(
 131     member_sl.member.function_name());
 132   static_assert(member_sl.member.line() == member_sl_line);
 133   // closing brace/paren of constructor
 134   static_assert(member_sl.member.column() == 29);
 135   static_assert(member_sl_fn_name.starts_with("int main()"sv));
 136   static_assert(member_sl_fi_name.ends_with("consteval.cc"sv));
 137
 138   constexpr std::string_view f_sl_fi_name(f_sl.file_name());
 139   constexpr std::string_view f_sl_fn_name(f_sl.function_name());
 140   static_assert(f_sl.line() == f_sl_line);
 141   // opening paren of call
 142   static_assert(f_sl.column() == 42);
 143   static_assert(f_sl_fn_name.ends_with("main()"sv));
 144   static_assert(f_sl_fi_name.ends_with("consteval.cc"sv));
 145
 146   return 0;
 147 }