libcxx/test/std/language.support/support.srcloc/general.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 // UNSUPPORTED: c++03, c++11, c++14, c++17
  10 // UNSUPPORTED: clang-15
  11 // UNSUPPORTED: apple-clang-14
  12
  13 #include <source_location>
  14
  15 #include <cassert>
  16 #include <concepts>
  17 #include <cstdint>
  18 #include <cstring>
  19 #include <type_traits>
  20
  21 #include "test_macros.h"
  22
  23 static_assert(std::is_nothrow_move_constructible_v<std::source_location>, "support.srcloc.cons (1.1)");
  24 static_assert(std::is_nothrow_move_assignable_v<std::source_location>, "support.srcloc.cons (1.2)");
  25 static_assert(std::is_nothrow_swappable_v<std::source_location>, "support.srcloc.cons (1.3)");
  26
  27 ASSERT_NOEXCEPT(std::source_location());
  28 ASSERT_NOEXCEPT(std::source_location::current());
  29
  30 // Note: the standard doesn't strictly require the particular values asserted
  31 // here, but does "suggest" them.  Additional tests for details of how the
  32 // implementation of current() chooses which location to report for more complex
  33 // scenarios are in the Clang test-suite, and not replicated here.
  34
  35 // A default-constructed value.
  36 constexpr std::source_location empty;
  37 static_assert(empty.line() == 0);
  38 static_assert(empty.column() == 0);
  39 static_assert(empty.file_name()[0] == '\0');
  40 static_assert(empty.function_name()[0] == '\0');
  41
  42 ASSERT_NOEXCEPT(empty.line());
  43 ASSERT_NOEXCEPT(empty.column());
  44 ASSERT_NOEXCEPT(empty.file_name());
  45 ASSERT_NOEXCEPT(empty.function_name());
  46 std::same_as<std::uint_least32_t> auto line   = empty.line();
  47 std::same_as<std::uint_least32_t> auto column = empty.column();
  48 std::same_as<const char*> auto file      = empty.file_name();
  49 std::same_as<const char*> auto function  = empty.function_name();
  50
  51 // A simple use of current() outside a function.
  52 constexpr std::source_location cur =
  53 #line 1000 "ss"
  54     std::source_location::current();
  55 static_assert(cur.line() == 1000);
  56 static_assert(cur.column() > 0);
  57 static_assert(cur.file_name()[0] == 's' && cur.file_name()[1] == 's' && cur.file_name()[2] == '\0');
  58 static_assert(cur.function_name()[0] == '\0');
  59
  60 // and inside a function.
  61 int main(int, char**) {
  62   auto local =
  63 #line 2000
  64       std::source_location::current();
  65   assert(strcmp(local.file_name(), "ss") == 0);
  66   assert(strstr(local.function_name(), "main") != nullptr);
  67   assert(local.line() == 2000);
  68   assert(local.column() > 0);
  69
  70   // Finally, the type should be copy-constructible
  71   auto local2 = cur;
  72   assert(strcmp(local2.file_name(), cur.file_name()) == 0);
  73   assert(strcmp(local2.function_name(), cur.function_name()) == 0);
  74   assert(local2.line() == cur.line());
  75   assert(local2.column() == cur.column());
  76
  77   // and copy-assignable.
  78   local = cur;
  79   assert(strcmp(local.file_name(), cur.file_name()) == 0);
  80   assert(strcmp(local.function_name(), cur.function_name()) == 0);
  81   assert(local.line() == cur.line());
  82   assert(local.column() == cur.column());
  83
  84   return 0;
  85 }