View source for cpp/thread/shared timed mutex

===Example===
{{todo|build a motivating example}}
{{example|A copy assignment operator for a class that holds resources that can handle multiple readers, but only one writer.
|code=
#include <mutex>
#include <shared_mutex>

class R
{
    mutable std::shared_timed_mutex mut;
    /* data */
public:
    R& operator=(const R& other)
    {
        // requires exclusive ownership to write to *this
        std::unique_lock<std::shared_timed_mutex> lhs(mut, std::defer_lock);
        // requires shared ownership to read from other
        std::shared_lock<std::shared_timed_mutex> rhs(other.mut, std::defer_lock);
        std::lock(lhs, rhs);
        /* assign data */
        return *this;
    }
};

int main()
{
    R r;
}
}}

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