std::any_cast
From cppreference.com
| template<class ValueType> ValueType any_cast(const any& operand); |
(1) | (since C++17) |
| template<class ValueType> ValueType any_cast(any& operand); |
(2) | (since C++17) |
| template<class ValueType> ValueType any_cast(any&& operand); |
(3) | (since C++17) |
| template<class ValueType> const ValueType* any_cast(const any* operand); |
(4) | (since C++17) |
| template<class ValueType> ValueType* any_cast(any* operand); |
(5) | (since C++17) |
Performs type-safe access to the contained object.
Let U be std::remove_cv_t<std::remove_reference_t<ValueType>>.
1) The program is ill-formed if is_constructible_v<ValueType, const U&> is not true.
2) The program is ill-formed if is_constructible_v<ValueType, U&> is not true.
3) The program is ill-formed if is_constructible_v<ValueType, U> is not true.
[edit] Parameters
| operand | - | target any object
|
[edit] Return value
1-2) Returns static_cast<ValueType>(*std::any_cast<U>(&operand))
3) Returns static_cast<ValueType>(std::move(*std::any_cast<U>(&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.[edit] Exceptions
1-3) Throws std::bad_any_cast if the
typeid of the requested ValueType does not match that of the contents of operand.4-5)
noexcept specification:
noexcept