Default Constructible
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| 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.
Refinement of
Associated types
Notation
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X
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A type that is a model of DefaultConstructible
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x
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An object of type X
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Definitions
Valid expressions
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Name
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Expression
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Type requirements
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Return type
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Default constructor
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X()
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X
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Default constructor
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X x; [1]
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Expression semantics
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Name
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Expression
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Precondition
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Semantics
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Postcondition
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Default constructor
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X()
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Default constructor
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X x;
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Complexity guarantees
Models
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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