30 lines
592 B
C++
30 lines
592 B
C++
#include <mutex>
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class some_big_object
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{};
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void swap(some_big_object& lhs,some_big_object& rhs)
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{}
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class X
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{
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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 main()
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{}
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