Книга: Standard Template Library Programmer
Default Constructible
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Default Constructible
Category: utilities
Component type: concept
Description
A type is DefaultConstructible if it has a default constructor, that is, if it is possible to construct an object of that type without initializing the object to any particular value.
Notation
X A type that is a model of DefaultConstructible
x An object of type X
Valid expressions
| Name | Expression | Return type |
|---|---|---|
| Default constructor | X() |
X |
| Default constructor | X x; [1] |
Expression semantics
| Name | Expression |
|---|---|
| Default constructor | X() |
| Default constructor | X x; |
Models
• int
• vector<double>
Notes
[1] The form X x = X() is not guaranteed to be a valid expression, because it uses a copy constructor. A type that is DefaultConstructible is not necessarily Assignable
See also
Assignable
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