C++ named requirements: CopyConstructible
Specifies that an instance of the type can be copy-constructed from an lvalue expression.
Requirements
The type T
satisfies CopyConstructible if.
- The type
T
satisfies MoveConstructible, and
Given.
-
v
, an lvalue expression of typeT
orconst T
or an rvalue expression of typeconst T
-
u
, an arbitrary identifier
The following expressions must be valid and have their specified effects.
Expression | Post-conditions |
---|---|
T u = v; |
The value of u is equivalent to the value of v . The value of |
T(v) |
The value of T(v) is equivalent to the value of v . The value of |
The expression |
(until C++11) |
Notes
Until C++11, classes that overloaded operator&
were not CopyConstructible and thus weren't usable in the standard library containers. As of C++11, the standard library uses std::addressof
whenever the address of an object is needed.
See also
(C++11)(C++11)(C++11)
|
checks if a type has a copy constructor (class template) |
(C++20)
|
specifies that an object of a type can be copy constructed and move constructed (concept) |
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