std::experimental:: any_cast
From cppreference.com
<
cpp
|
experimental
|
any
|
template
<
class
ValueType
>
ValueType any_cast ( const any & operand ) ; |
(1) | (library fundamentals TS) |
|
template
<
class
ValueType
>
ValueType any_cast ( any & operand ) ; |
(2) | (library fundamentals TS) |
|
template
<
class
ValueType
>
ValueType any_cast ( any && operand ) ; |
(3) | (library fundamentals TS) |
|
template
<
class
ValueType
>
const ValueType * any_cast ( const any * operand ) noexcept ; |
(4) | (library fundamentals TS) |
|
template
<
class
ValueType
>
ValueType * any_cast ( any * operand ) noexcept ; |
(5) | (library fundamentals TS) |
Performs type-safe access to the contained object.
For
(1-3)
, the program is ill-formed if
ValueType
is not a reference and
std::
is_copy_constructible
<
ValueType
>
::
value
is
false
.
Parameters
| operand | - |
target
any
object
|
Return value
1)
Returns
*
any_cast
<
std::
add_const_t
<
std::
remove_reference_t
<
ValueType
>>>
(
&
operand
)
.
2,3)
Returns
*
any_cast
<
std::
remove_reference_t
<
ValueType
>>
(
&
operand
)
.
4,5)
If
operand
is not a null pointer, and the
typeid
of the requested
ValueType
matches that of the contents of
operand
, a pointer to the value contained by
operand
, otherwise a null pointer.
Exceptions
1-3)
Throws
bad_any_cast
if the
typeid
of the requested
ValueType
does not match that of the contents of
operand
.