Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Move assignment.

storage_ptr&
operator=(
    storage_ptr&& other) noexcept;
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Copy assignment.

storage_ptr&
operator=(
    storage_ptr const& other) noexcept;
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