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std::experimental::any_cast

From cppreference.com
< cpp‎ | experimental‎ | any
 
 
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Extensions for concurrency 2 (concurrency TS v2)
Concepts (concepts TS)
Ranges (ranges TS)
Reflection (reflection TS)
Mathematical special functions (special functions TR)
 
 
 
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.

[edit] Parameters

operand - target any object

[edit] 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.

[edit] Exceptions

1-3) Throws bad_any_cast if the typeid of the requested ValueType does not match that of the contents of operand.