| // RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.33 -std=c++20 -verify %s |
| |
| [[msvc::constexpr]] int log2(int x) { [[msvc::constexpr]] return x > 1 ? 1 + log2(x / 2) : 0; } |
| constexpr bool test_log2() { [[msvc::constexpr]] return log2(32) == 5; } |
| static_assert(test_log2()); |
| |
| [[msvc::constexpr]] int get_value(int x) |
| { |
| switch (x) |
| { |
| case 42: return 1337; |
| default: |
| if (x < 0) [[msvc::constexpr]] return log2(-x); |
| else return x; |
| } |
| } |
| |
| constexpr bool test_complex_expr() { |
| [[msvc::constexpr]] return get_value(get_value(42) - 1337 + get_value(-32) - 5 + (get_value(1) ? get_value(0) : get_value(2))) == get_value(0); |
| } |
| static_assert(test_complex_expr()); |
| |
| constexpr bool get_constexpr_true() { return true; } |
| [[msvc::constexpr]] bool get_msconstexpr_true() { return get_constexpr_true(); } |
| constexpr bool test_get_msconstexpr_true() { [[msvc::constexpr]] return get_msconstexpr_true(); } |
| static_assert(test_get_msconstexpr_true()); |
| |
| // TODO (#72149): Add support for [[msvc::constexpr]] constructor; this code is valid for MSVC. |
| struct S2 { |
| [[msvc::constexpr]] S2() {} |
| [[msvc::constexpr]] bool value() { return true; } |
| static constexpr bool check() { [[msvc::constexpr]] return S2{}.value(); } // expected-error {{constexpr function never produces a constant expression}} \ |
| // expected-note {{non-literal type 'S2' cannot be used in a constant expression}} \ |
| // expected-note {{non-literal type 'S2' cannot be used in a constant expression}} |
| }; |
| static_assert(S2::check()); // expected-error {{static assertion expression is not an integral constant expression}} \ |
| // expected-note {{in call to 'check()'}} |