clang/test/SemaCXX/builtin-std-move-nobuiltin.cpp

   1 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=builtin
   2 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=nobuiltin -fno-builtin
   3 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=nobuiltin -fno-builtin-std-move -fno-builtin-std-move_if_noexcept -fno-builtin-std-forward -fno-builtin-std-forward_like
   4 // RUN: %clang_cc1 -std=c++20 -verify %s -DBUILTIN=nobuiltin -ffreestanding
   5 // expected-no-diagnostics
   6
   7 int nobuiltin;
   8
   9 namespace std {
  10   template<typename T> constexpr T &&move(T &x) { return (T&&)nobuiltin; }
  11   template<typename T> constexpr T &&move_if_noexcept(T &x) { return (T&&)nobuiltin; }
  12   template<typename T> constexpr T &&forward(T &x) { return (T&&)nobuiltin; }
  13   template<typename U, typename T> constexpr T &&forward_like(T &X) { return (T&&)nobuiltin; }
  14 }
  15
  16 template<typename T> constexpr T *addr(T &&r) { return &r; }
  17
  18 int builtin;
  19 static_assert(addr(std::move(builtin)) == &BUILTIN);
  20 static_assert(addr(std::move_if_noexcept(builtin)) == &BUILTIN);
  21 static_assert(addr(std::forward(builtin)) == &BUILTIN);
  22 static_assert(addr(std::forward_like<int&>(builtin)) == &BUILTIN);