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This is an attempt to make boost::atomic<> interface closer to the standard. It makes a difference in C++17 as it mandates copy elision, which makes this code possible: boost::atomic<int> a = 10; It also makes is_convertible<T, boost::atomic<T>> return true, which has implications on the standard library components, such as std::pair. This removes the workaround for gcc 4.7, which complains that operator=(value_arg_type) is considered ambiguous with operator=(atomic const&) in assignment expressions, even though conversion to atomic<> is less preferred than conversion to value_arg_type. We try to work around the problem from the operator= side. Added a new compile test to check that the initializing constructor is implicit.