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allocator.h
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1 // Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
2 // Distributed under MIT license, or public domain if desired and
3 // recognized in your jurisdiction.
4 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
5
6 #ifndef JSON_ALLOCATOR_H_INCLUDED
7 #define JSON_ALLOCATOR_H_INCLUDED
8
9 #include <cstring>
10 #include <memory>
11
12 #pragma pack(push, 8)
13
14 namespace Json {
15 template <typename T> class SecureAllocator {
16 public:
17 // Type definitions
18 using value_type = T;
19 using pointer = T*;
20 using const_pointer = const T*;
21 using reference = T&;
22 using const_reference = const T&;
23 using size_type = std::size_t;
24 using difference_type = std::ptrdiff_t;
25
29 pointer allocate(size_type n) {
30 // allocate using "global operator new"
31 return static_cast<pointer>(::operator new(n * sizeof(T)));
32 }
33
41 void deallocate(volatile pointer p, size_type n) {
42 std::memset(p, 0, n * sizeof(T));
43 // free using "global operator delete"
44 ::operator delete(p);
45 }
46
50 template <typename... Args> void construct(pointer p, Args&&... args) {
51 // construct using "placement new" and "perfect forwarding"
52 ::new (static_cast<void*>(p)) T(std::forward<Args>(args)...);
53 }
54
55 size_type max_size() const { return size_t(-1) / sizeof(T); }
56
57 pointer address(reference x) const { return std::addressof(x); }
58
59 const_pointer address(const_reference x) const { return std::addressof(x); }
60
64 void destroy(pointer p) {
65 // destroy using "explicit destructor"
66 p->~T();
67 }
68
69 // Boilerplate
70 SecureAllocator() {}
71 template <typename U> SecureAllocator(const SecureAllocator<U>&) {}
72 template <typename U> struct rebind { using other = SecureAllocator<U>; };
73 };
74
75 template <typename T, typename U>
76 bool operator==(const SecureAllocator<T>&, const SecureAllocator<U>&) {
77 return true;
78 }
79
80 template <typename T, typename U>
81 bool operator!=(const SecureAllocator<T>&, const SecureAllocator<U>&) {
82 return false;
83 }
84
85 } // namespace Json
86
87 #pragma pack(pop)
88
89 #endif // JSON_ALLOCATOR_H_INCLUDED
Json::SecureAllocator::const_pointer
const T * const_pointer
Definition: allocator.h:20
Json::SecureAllocator::allocate
pointer allocate(size_type n)
Allocate memory for N items using the standard allocator.
Definition: allocator.h:29
Json::SecureAllocator::destroy
void destroy(pointer p)
Destroy an item in-place at pointer P.
Definition: allocator.h:64
Json::CharReaderBuilder::newCharReader
CharReader * newCharReader() const override
Allocate a CharReader via operator new().
Definition: json_reader.cpp:1880
Json::Value::size
ArrayIndex size() const
Number of values in array or object.
Definition: json_value.cpp:859
Json::operator==
bool operator==(const SecureAllocator< T > &, const SecureAllocator< U > &)
Definition: allocator.h:76
Json::CharReaderBuilder::settings_
Json::Value settings_
Configuration of this builder.
Definition: reader.h:332
Json::SecureAllocator::SecureAllocator
SecureAllocator(const SecureAllocator< U > &)
Definition: allocator.h:71
Json::operator!=
bool operator!=(const SecureAllocator< T > &, const SecureAllocator< U > &)
Definition: allocator.h:81
Json::SecureAllocator
Definition: allocator.h:15
Json::SecureAllocator::max_size
size_type max_size() const
Definition: allocator.h:55
Json::SecureAllocator::deallocate
void deallocate(volatile pointer p, size_type n)
Release memory which was allocated for N items at pointer P.
Definition: allocator.h:41
Json::SecureAllocator::pointer
T * pointer
Definition: allocator.h:19
Json::SecureAllocator::address
pointer address(reference x) const
Definition: allocator.h:57
Json::Value
Represents a JSON value.
Definition: value.h:193
Json::SecureAllocator::SecureAllocator
SecureAllocator()
Definition: allocator.h:70
Json::SecureAllocator::construct
void construct(pointer p, Args &&... args)
Construct an item in-place at pointer P.
Definition: allocator.h:50
Json::SecureAllocator::size_type
std::size_t size_type
Definition: allocator.h:23
Json
JSON (JavaScript Object Notation).
Definition: allocator.h:14
Json::Value::asString
String asString() const
Embedded zeroes are possible.
Definition: json_value.cpp:628
Json::SecureAllocator::rebind
Definition: allocator.h:72
Json::SecureAllocator::difference_type
std::ptrdiff_t difference_type
Definition: allocator.h:24
Json::writeString
String writeString(StreamWriter::Factory const &factory, Value const &root)
Write into stringstream, then return string, for convenience.
Definition: json_writer.cpp:1244
Json::SecureAllocator::const_reference
const T & const_reference
Definition: allocator.h:22
Json::SecureAllocator::value_type
T value_type
Definition: allocator.h:18
Json::parseFromStream
bool parseFromStream(CharReader::Factory const &, IStream &, Value *root, String *errs)
Consume entire stream and use its begin/end.
Definition: json_reader.cpp:1968
Json::StreamWriterBuilder
Build a StreamWriter implementation.
Definition: writer.h:89
Json::SecureAllocator::reference
T & reference
Definition: allocator.h:21
Json::Value::get
Value get(ArrayIndex index, const Value &defaultValue) const
If the array contains at least index+1 elements, returns the element value, otherwise returns default...
Definition: json_value.cpp:1074
Json::SecureAllocator::address
const_pointer address(const_reference x) const
Definition: allocator.h:59
Json::CharReaderBuilder
Build a CharReader implementation.
Definition: reader.h:289