tmp/tmpt4gowb7u/{from.md → to.md}
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### Concept <a id="concept.copyconstructible">[[concept.copyconstructible]]</a>
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``` cpp
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template<class T>
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concept copy_constructible =
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move_constructible<T> &&
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constructible_from<T, T&> && convertible_to<T&, T> &&
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constructible_from<T, const T&> && convertible_to<const T&, T> &&
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constructible_from<T, const T> && convertible_to<const T, T>;
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```
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If `T` is an object type, then let `v` be an lvalue of type (possibly
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`const`) `T` or an rvalue of type `const T`. `T` models
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`copy_constructible` only if
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- After the definition `T u = v;`, `u` is equal to `v`
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[[concepts.equality]] and `v` is not modified.
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- `T(v)` is equal to `v` and does not modify `v`.
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