7d2d5a3a6d
This extends the effects of [[ http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1825r0.html | P1825 ]] to all C++ standards from C++11 up to C++20. According to Motion 23 from Cologne 2019, P1825R0 was accepted as a Defect Report, so we retroactively apply this all the way back to C++11. Note that we also remove implicit moves from C++98 as an extension altogether, since the expanded first overload resolution from P1825 can cause some meaning changes in C++98. For example it can change which copy constructor is picked when both const and non-const ones are available. This also rips out warn_return_std_move since there are no cases where it would be worthwhile to suggest it. This also fixes a bug with bailing into the second overload resolution when encountering a non-rvref qualified conversion operator. This was unnoticed until now, so two new test cases cover these. Signed-off-by: Matheus Izvekov <mizvekov@gmail.com> Reviewed By: rsmith Differential Revision: https://reviews.llvm.org/D104500
69 lines
1.2 KiB
C++
69 lines
1.2 KiB
C++
// RUN: %clang_cc1 -std=c++2b -fsyntax-only -fcxx-exceptions -verify %s
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// RUN: %clang_cc1 -std=c++20 -fsyntax-only -fcxx-exceptions -verify %s
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// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fcxx-exceptions -verify %s
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// expected-no-diagnostics
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// Throwing
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namespace test_throwing {
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class Widget {
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public:
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Widget(Widget &&);
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Widget(const Widget &) = delete;
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};
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void seven(Widget w) {
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throw w;
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}
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} // namespace test_throwing
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// Non-constructor conversion
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namespace test_non_constructor_conversion {
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class Widget {};
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struct To {
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operator Widget() const & = delete;
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operator Widget() &&;
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};
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Widget nine() {
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To t;
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return t;
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}
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} // namespace test_non_constructor_conversion
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// By-value sinks
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namespace test_by_value_sinks {
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class Widget {
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public:
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Widget();
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Widget(Widget &&);
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Widget(const Widget &) = delete;
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};
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struct Fowl {
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Fowl(Widget);
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};
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Fowl eleven() {
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Widget w;
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return w;
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}
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} // namespace test_by_value_sinks
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// Slicing
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namespace test_slicing {
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class Base {
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public:
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Base();
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Base(Base &&);
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Base(Base const &) = delete;
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};
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class Derived : public Base {};
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Base thirteen() {
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Derived result;
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return result;
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}
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} // namespace test_slicing
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