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Add MemberCapacity() and MemberReserve() interface for object type.

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h46incon 2017-10-19 20:41:27 +08:00
parent 7d424c0bbc
commit a8e9990603
1 changed files with 22 additions and 11 deletions
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33
include/rapidjson/document.h
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@ -1070,6 +1070,9 @@ public:
//! Get the number of members in the object.
SizeType MemberCount() const { RAPIDJSON_ASSERT(IsObject()); return data_.o.size; }
//! Get the capacity of object.
SizeType MemberCapacity() const { RAPIDJSON_ASSERT(IsObject()); return data_.o.capacity; }
//! Check whether the object is empty.
bool ObjectEmpty() const { RAPIDJSON_ASSERT(IsObject()); return data_.o.size == 0; }
@ -1138,6 +1141,21 @@ public:
/*! \pre IsObject() == true */
MemberIterator MemberEnd() { RAPIDJSON_ASSERT(IsObject()); return MemberIterator(GetMembersPointer() + data_.o.size); }
//! Request the object to have enough capacity to store members.
/*! \param newCapacity The capacity that the object at least need to have.
\param allocator Allocator for reallocating memory. It must be the same one as used before. Commonly use GenericDocument::GetAllocator().
\return The value itself for fluent API.
\note Linear time complexity.
*/
GenericValue& MemberReserve(SizeType newCapacity, Allocator &allocator) {
RAPIDJSON_ASSERT(IsObject());
if (newCapacity > data_.o.capacity) {
SetMembersPointer(reinterpret_cast<Member*>(allocator.Realloc(GetMembersPointer(), data_.o.capacity * sizeof(Member), newCapacity * sizeof(Member))));
data_.o.capacity = newCapacity;
}
return *this;
}
//! Check whether a member exists in the object.
/*!
\param name Member name to be searched.
@ -1243,17 +1261,8 @@ public:
RAPIDJSON_ASSERT(name.IsString());
ObjectData& o = data_.o;
if (o.size >= o.capacity) {
if (o.capacity == 0) {
o.capacity = kDefaultObjectCapacity;
SetMembersPointer(reinterpret_cast<Member*>(allocator.Malloc(o.capacity * sizeof(Member))));
}
else {
SizeType oldCapacity = o.capacity;
o.capacity += (oldCapacity + 1) / 2; // grow by factor 1.5
SetMembersPointer(reinterpret_cast<Member*>(allocator.Realloc(GetMembersPointer(), oldCapacity * sizeof(Member), o.capacity * sizeof(Member))));
}
}
if (o.size >= o.capacity)
MemberReserve(o.capacity == 0 ? kDefaultObjectCapacity : (o.capacity + (o.capacity + 1) / 2), allocator);
Member* members = GetMembersPointer();
members[o.size].name.RawAssign(name);
members[o.size].value.RawAssign(value);
@ -2548,6 +2557,7 @@ public:
~GenericObject() {}
SizeType MemberCount() const { return value_.MemberCount(); }
SizeType MemberCapacity() const { return value_.MemberCapacity(); }
bool ObjectEmpty() const { return value_.ObjectEmpty(); }
template <typename T> ValueType& operator[](T* name) const { return value_[name]; }
template <typename SourceAllocator> ValueType& operator[](const GenericValue<EncodingType, SourceAllocator>& name) const { return value_[name]; }
@ -2556,6 +2566,7 @@ public:
#endif
MemberIterator MemberBegin() const { return value_.MemberBegin(); }
MemberIterator MemberEnd() const { return value_.MemberEnd(); }
GenericObject MemberReserve(SizeType newCapacity, AllocatorType &allocator) const { value_.MemberReserve(newCapacity, allocator); return *this; }
bool HasMember(const Ch* name) const { return value_.HasMember(name); }
#if RAPIDJSON_HAS_STDSTRING
bool HasMember(const std::basic_string<Ch>& name) const { return value_.HasMember(name); }