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Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>
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Josh Soref
2022-11-01 21:46:38 -04:00
committed by Andrzej Krzemienski
parent 246f1663e1
commit 46ad495a60
5 changed files with 7 additions and 7 deletions
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doc/01_quick_start.qbk
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@ -91,7 +91,7 @@ We could write function `convert` in a slightly different manner, so that it has
return ans;
}
The default constructor of `optional` creates an unitialized optional object. Unlike with `int`s you cannot have an `optional<int>` in an indeterminate state. Its state is always well defined. Instruction `ans = i` initializes the optional object. It uses the 'mixed' assignment from `int`. In general, for `optional<T>`, when an assignment from `T` is invoked, it can do two things. If the optional object is not initialized (our case here), it initializes the contained value using `T`'s copy constructor. If the optional object is already initialized, it assigns the new value to it using `T`'s copy assignment.
The default constructor of `optional` creates an uninitialized optional object. Unlike with `int`s you cannot have an `optional<int>` in an indeterminate state. Its state is always well defined. Instruction `ans = i` initializes the optional object. It uses the 'mixed' assignment from `int`. In general, for `optional<T>`, when an assignment from `T` is invoked, it can do two things. If the optional object is not initialized (our case here), it initializes the contained value using `T`'s copy constructor. If the optional object is already initialized, it assigns the new value to it using `T`'s copy assignment.
[endsect]
[section Optional data members]