diff options
Diffstat (limited to 'clang/test/SemaCXX/warn-unused-result.cpp')
| -rw-r--r-- | clang/test/SemaCXX/warn-unused-result.cpp | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/clang/test/SemaCXX/warn-unused-result.cpp b/clang/test/SemaCXX/warn-unused-result.cpp index fe7d5ea..447654e 100644 --- a/clang/test/SemaCXX/warn-unused-result.cpp +++ b/clang/test/SemaCXX/warn-unused-result.cpp @@ -365,6 +365,31 @@ void id_print_name() { } } // namespace GH117975 +namespace inheritance { +// Test that [[nodiscard]] is not inherited by derived class types, +// but is inherited by member functions +struct [[nodiscard]] E { + [[nodiscard]] explicit E(int); + explicit E(const char*); + [[nodiscard]] int f(); +}; +struct F : E { + using E::E; +}; +E e(); +F f(); +void test() { + e(); // expected-warning {{ignoring return value of type 'E' declared with 'nodiscard' attribute}} + f(); // no warning: derived class type does not inherit the attribute + E(1); // expected-warning {{ignoring temporary created by a constructor declared with 'nodiscard' attribute}} + E("x"); // expected-warning {{ignoring temporary of type 'E' declared with 'nodiscard' attribute}} + F(1); // no warning: inherited constructor does not inherit the attribute either + F("x"); // no warning + e().f(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} + f().f(); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}} +} +} // namespace inheritance + namespace BuildStringOnClangScope { [[clang::warn_unused_result("Discarded result")]] @@ -381,4 +406,4 @@ void doGccThings() { makeGccTrue(); // expected-warning {{ignoring return value of function declared with 'gnu::warn_unused_result' attribute}} } -} +} // namespace BuildStringOnClangScope |