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prohibit C++11 move from Document to Value

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As reported in #387, silently moving a `GenericDocument` to a
`GenericValue` can lead to object slicing and premature deletion of
the owning allocator of the (surviving) `GenericValue`.

To reduce this risk, prohibit move construction of a `GenericValue`
from a `GenericDocument`.
This commit is contained in:
Philipp A. Hartmann 2015-07-17 08:24:43 +02:00
parent 823b731896
commit fec9e8a4f2
1 changed files with 14 additions and 1 deletions
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15
include/rapidjson/document.h
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@ -69,6 +69,9 @@ RAPIDJSON_NAMESPACE_BEGIN
template <typename Encoding, typename Allocator>
class GenericValue;
template <typename Encoding, typename Allocator, typename StackAllocator>
class GenericDocument;
//! Name-value pair in a JSON object value.
/*!
This class was internal to GenericValue. It used to be a inner struct.
@ -446,6 +449,16 @@ private:
//! Copy constructor is not permitted.
GenericValue(const GenericValue& rhs);
#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
//! Moving from a GenericDocument is not permitted.
template <typename StackAllocator>
GenericValue(GenericDocument<Encoding,Allocator,StackAllocator>&& rhs);
//! Move assignment from a GenericDocument is not permitted.
template <typename StackAllocator>
GenericValue& operator=(GenericDocument<Encoding,Allocator,StackAllocator>&& rhs);
#endif
public:
//! Constructor with JSON value type.
@ -1792,7 +1805,7 @@ public:
#if RAPIDJSON_HAS_CXX11_RVALUE_REFS
//! Move constructor in C++11
GenericDocument(GenericDocument&& rhs) RAPIDJSON_NOEXCEPT
: ValueType(std::move(rhs)),
: ValueType(std::forward<ValueType>(rhs)), // explicit cast to avoid prohibited move from Document
allocator_(rhs.allocator_),
ownAllocator_(rhs.ownAllocator_),
stack_(std::move(rhs.stack_)),