34 lines
573 B
C++
34 lines
573 B
C++
#include <mutex>
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class some_big_object {
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};
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void
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swap(some_big_object& lhs, some_big_object& rhs)
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{
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}
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class X {
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private:
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some_big_object some_detail;
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mutable std::mutex m;
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public:
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X(some_big_object const& sd) : some_detail(sd) {}
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friend void swap(X& lhs, X& rhs)
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{
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if (&lhs == &rhs)
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return;
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std::lock(lhs.m, rhs.m);
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std::lock_guard<std::mutex> lock_a(lhs.m, std::adopt_lock);
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std::lock_guard<std::mutex> lock_b(rhs.m, std::adopt_lock);
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swap(lhs.some_detail, rhs.some_detail);
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}
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};
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int
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main()
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{
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}
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