voidify
|
template
<
class
T
>
void * voidify ( T & obj ) noexcept ; |
(
exposition only*
)
(constexpr since C++17) |
|
Returns the address of obj (implicitly converted to void * ).
Contents |
Parameters
| obj | - | the object whose address will be taken |
Return value
|
& obj |
(until C++11) |
|
std:: addressof ( obj ) |
(since C++11) |
Notes
This exposition-only function is introduced by P0896R4 . It is used to describe the effects of uninitialized memory algorithms which construct objects in uninitialized memory areas. The result pointer is used as the placement-params of a placement new expression .
Initially, the return value was const_cast < void * > ( static_cast < const volatile void * > ( std:: addressof ( obj ) ) ) , which breaks const-correctness. The explicit casts were removed by the resolution of LWG issue 3870 , and the only conversion left is the implicit conversion to void * .
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 3870 | C++98 | the explicit casts broke const-correctness | removed these casts |
See also
|
copies a range of objects to an uninitialized area of memory
(function template) |
|
|
(C++20)
|
copies a range of objects to an uninitialized area of memory
(algorithm function object) |
|
copies an object to an uninitialized area of memory, defined by a range
(function template) |
|
|
(C++20)
|
copies an object to an uninitialized area of memory, defined by a range
(algorithm function object) |
|
(C++17)
|
moves a range of objects to an uninitialized area of memory
(function template) |
|
(C++20)
|
moves a range of objects to an uninitialized area of memory
(algorithm function object) |
|
(C++17)
|
constructs objects by
default-initialization
in an uninitialized area of memory, defined by a range
(function template) |
|
constructs objects by
default-initialization
in an uninitialized area of memory, defined by a range
(algorithm function object) |
|
|
(C++17)
|
constructs objects by
value-initialization
in an uninitialized area of memory, defined by a range
(function template) |
|
constructs objects by
value-initialization
in an uninitialized area of memory, defined by a range
(algorithm function object) |
|
|
(C++20)
|
creates an object at a given address
(function template) |
|
(C++20)
|
creates an object at a given address
(algorithm function object) |