Library: Foundation
Package: Core
Header: Poco/Any.h
Description
ValueHolder union (used by Poco::Any and Poco::Dynamic::Var for small object optimization, when enabled).
If Holder<Type> fits into POCO_SMALL_OBJECT_SIZE bytes of storage, it will be placement-new-allocated into the local buffer (i.e. there will be no heap-allocation). The local buffer size is one byte larger - [POCO_SMALL_OBJECT_SIZE + 1], additional byte value indicating where the object was allocated (0 => heap, 1 => local).
Important: for SOO builds, only same-type (or trivial both-empty no-op) swap operation is allowed.
Member Summary
Member Functions: assign, content, erase, isEmpty, isLocal, operator =, swap
Nested Classes
struct Size
Constructors
Placeholder 
Placeholder();
Placeholder
Placeholder(
const Placeholder & param157
) = delete;
Placeholder
Placeholder(
Placeholder && param158
) = delete;
Destructor
~Placeholder
~Placeholder();
Member Functions
assign
template < typename T, typename V, typename std::enable_if < TypeSizeLE < T, Placeholder::Size::value >::value >::type * = nullptr > PlaceholderT * assign(
const V & value
);
assign
template < typename T, typename V, typename std::enable_if < TypeSizeGT < T, Placeholder::Size::value >::value >::type * = nullptr > PlaceholderT * assign(
const V & value
);
content
PlaceholderT * content() const;
erase
void erase();
isEmpty
bool isEmpty() const;
isLocal
bool isLocal() const;
operator =
Placeholder & operator = (
const Placeholder & param159
) = delete;
operator =
Placeholder & operator = (
Placeholder && param160
) = delete;
swap
void swap(
Placeholder & other
) noexcept;