forked from OSchip/llvm-project
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
// This is a test for an egregious hack in Clang that works around
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// an issue with GCC's <utility> implementation. std::pair::swap
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// has an exception specification that makes an unqualified call to
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// swap. This is invalid, because it ends up calling itself with
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// the wrong number of arguments.
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//
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// The same problem afflicts a bunch of other class templates. Those
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// affected are array, pair, priority_queue, stack, and queue.
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=array
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=pair
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=priority_queue
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=stack
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=queue
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// MSVC's standard library uses a very similar pattern that relies on delayed
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// parsing of exception specifications.
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//
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// RUN: %clang_cc1 -fsyntax-only %s -std=c++11 -verify -fexceptions -fcxx-exceptions -DCLASS=array -DMSVC
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#ifdef BE_THE_HEADER
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#pragma GCC system_header
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namespace std {
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template<typename T> void swap(T &, T &);
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template<typename T> void do_swap(T &a, T &b) noexcept(noexcept(swap(a, b))) {
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swap(a, b);
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}
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template<typename A, typename B> struct CLASS {
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#ifdef MSVC
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void swap(CLASS &other) noexcept(noexcept(do_swap(member, other.member)));
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#endif
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A member;
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#ifndef MSVC
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void swap(CLASS &other) noexcept(noexcept(swap(member, other.member)));
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#endif
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};
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// template<typename T> void do_swap(T &, T &);
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// template<typename A> struct vector {
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// void swap(vector &other) noexcept(noexcept(do_swap(member, other.member)));
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// A member;
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// };
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}
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#else
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#define BE_THE_HEADER
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#include __FILE__
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struct X {};
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using PX = std::CLASS<X, X>;
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using PI = std::CLASS<int, int>;
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void swap(X &, X &) noexcept;
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PX px;
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PI pi;
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static_assert(noexcept(px.swap(px)), "");
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static_assert(!noexcept(pi.swap(pi)), "");
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namespace sad {
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template<typename T> void swap(T &, T &);
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template<typename A, typename B> struct CLASS {
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void swap(CLASS &other) noexcept(noexcept(swap(*this, other))); // expected-error {{too many arguments}} expected-note {{declared here}}
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};
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CLASS<int, int> pi;
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static_assert(!noexcept(pi.swap(pi)), ""); // expected-note {{in instantiation of}}
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}
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#endif
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