48f35e074e
Summary: This patch implements the variadic `lock_guard` paper. Making `lock_guard` variadic is a ABI breaking change because the specialization `lock_guard<_Mutex>` mangles differently then when it was the primary template. This change only provides variadic `lock_guard` in ABI V2 or when `_LIBCPP_ABI_VARIADIC_LOCK_GUARD` is defined. Note that in ABI V2 `lock_guard` must always be declared as a variadic template, even in C++03, in order to keep the ABI consistent. For this reason `lock_guard` is forward declared as a variadic template in all standard dialects and therefore depends on variadic templates being provided as an extension in C++03. All supported versions of Clang and GCC provide this extension. Reviewers: mclow.lists Subscribers: K-ballo, mclow.lists, cfe-commits Differential Revision: http://reviews.llvm.org/D21260 llvm-svn: 272634
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: libcpp-has-no-threads
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// UNSUPPORTED: c++98, c++03
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// <mutex>
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// template <class ...Mutex> class lock_guard;
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// lock_guard& operator=(lock_guard const&) = delete;
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#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
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#include <mutex>
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int main()
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{
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using M = std::mutex;
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M m0, m1, m2;
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M om0, om1, om2;
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{
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using LG = std::lock_guard<>;
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LG lg1, lg2;
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lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}
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}
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{
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using LG = std::lock_guard<M, M>;
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LG lg1(m0, m1);
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LG lg2(om0, om1);
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lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}
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}
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{
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using LG = std::lock_guard<M, M, M>;
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LG lg1(m0, m1, m2);
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LG lg2(om0, om1, om2);
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lg1 = lg2; // expected-error{{overload resolution selected deleted operator '='}}
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}
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}
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