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json test

jsoncpp/include/json/allocator.h@0:2ee762ea11b3, 2018-01-26 (annotated)

Committer:
tgw
Date:
Fri Jan 26 06:05:31 2018 +0000
Revision:
0:2ee762ea11b3
json

Who changed what in which revision?

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tgw 0:2ee762ea11b3 1 // Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
tgw 0:2ee762ea11b3 2 // Distributed under MIT license, or public domain if desired and
tgw 0:2ee762ea11b3 3 // recognized in your jurisdiction.
tgw 0:2ee762ea11b3 4 // See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
tgw 0:2ee762ea11b3 5
tgw 0:2ee762ea11b3 6 #ifndef CPPTL_JSON_ALLOCATOR_H_INCLUDED
tgw 0:2ee762ea11b3 7 #define CPPTL_JSON_ALLOCATOR_H_INCLUDED
tgw 0:2ee762ea11b3 8
tgw 0:2ee762ea11b3 9 #include <cstring>
tgw 0:2ee762ea11b3 10 #include <memory>
tgw 0:2ee762ea11b3 11
tgw 0:2ee762ea11b3 12 #pragma pack(push, 8)
tgw 0:2ee762ea11b3 13
tgw 0:2ee762ea11b3 14 namespace Json {
tgw 0:2ee762ea11b3 15 template<typename T>
tgw 0:2ee762ea11b3 16 class SecureAllocator {
tgw 0:2ee762ea11b3 17 public:
tgw 0:2ee762ea11b3 18 // Type definitions
tgw 0:2ee762ea11b3 19 using value_type = T;
tgw 0:2ee762ea11b3 20 using pointer = T*;
tgw 0:2ee762ea11b3 21 using const_pointer = const T*;
tgw 0:2ee762ea11b3 22 using reference = T&;
tgw 0:2ee762ea11b3 23 using const_reference = const T&;
tgw 0:2ee762ea11b3 24 using size_type = std::size_t;
tgw 0:2ee762ea11b3 25 using difference_type = std::ptrdiff_t;
tgw 0:2ee762ea11b3 26
tgw 0:2ee762ea11b3 27 /**
tgw 0:2ee762ea11b3 28 * Allocate memory for N items using the standard allocator.
tgw 0:2ee762ea11b3 29 */
tgw 0:2ee762ea11b3 30 pointer allocate(size_type n) {
tgw 0:2ee762ea11b3 31 // allocate using "global operator new"
tgw 0:2ee762ea11b3 32 return static_cast<pointer>(::operator new(n * sizeof(T)));
tgw 0:2ee762ea11b3 33 }
tgw 0:2ee762ea11b3 34
tgw 0:2ee762ea11b3 35 /**
tgw 0:2ee762ea11b3 36 * Release memory which was allocated for N items at pointer P.
tgw 0:2ee762ea11b3 37 *
tgw 0:2ee762ea11b3 38 * The memory block is filled with zeroes before being released.
tgw 0:2ee762ea11b3 39 * The pointer argument is tagged as "volatile" to prevent the
tgw 0:2ee762ea11b3 40 * compiler optimizing out this critical step.
tgw 0:2ee762ea11b3 41 */
tgw 0:2ee762ea11b3 42 void deallocate(volatile pointer p, size_type n) {
tgw 0:2ee762ea11b3 43 std::memset(p, 0, n * sizeof(T));
tgw 0:2ee762ea11b3 44 // free using "global operator delete"
tgw 0:2ee762ea11b3 45 ::operator delete(p);
tgw 0:2ee762ea11b3 46 }
tgw 0:2ee762ea11b3 47
tgw 0:2ee762ea11b3 48 /**
tgw 0:2ee762ea11b3 49 * Construct an item in-place at pointer P.
tgw 0:2ee762ea11b3 50 */
tgw 0:2ee762ea11b3 51 template<typename... Args>
tgw 0:2ee762ea11b3 52 void construct(pointer p, Args&&... args) {
tgw 0:2ee762ea11b3 53 // construct using "placement new" and "perfect forwarding"
tgw 0:2ee762ea11b3 54 ::new (static_cast<void*>(p)) T(std::forward<Args>(args)...);
tgw 0:2ee762ea11b3 55 }
tgw 0:2ee762ea11b3 56
tgw 0:2ee762ea11b3 57 size_type max_size() const {
tgw 0:2ee762ea11b3 58 return size_t(-1) / sizeof(T);
tgw 0:2ee762ea11b3 59 }
tgw 0:2ee762ea11b3 60
tgw 0:2ee762ea11b3 61 pointer address( reference x ) const {
tgw 0:2ee762ea11b3 62 return std::addressof(x);
tgw 0:2ee762ea11b3 63 }
tgw 0:2ee762ea11b3 64
tgw 0:2ee762ea11b3 65 const_pointer address( const_reference x ) const {
tgw 0:2ee762ea11b3 66 return std::addressof(x);
tgw 0:2ee762ea11b3 67 }
tgw 0:2ee762ea11b3 68
tgw 0:2ee762ea11b3 69 /**
tgw 0:2ee762ea11b3 70 * Destroy an item in-place at pointer P.
tgw 0:2ee762ea11b3 71 */
tgw 0:2ee762ea11b3 72 void destroy(pointer p) {
tgw 0:2ee762ea11b3 73 // destroy using "explicit destructor"
tgw 0:2ee762ea11b3 74 p->~T();
tgw 0:2ee762ea11b3 75 }
tgw 0:2ee762ea11b3 76
tgw 0:2ee762ea11b3 77 // Boilerplate
tgw 0:2ee762ea11b3 78 SecureAllocator() {}
tgw 0:2ee762ea11b3 79 template<typename U> SecureAllocator(const SecureAllocator<U>&) {}
tgw 0:2ee762ea11b3 80 template<typename U> struct rebind { using other = SecureAllocator<U>; };
tgw 0:2ee762ea11b3 81 };
tgw 0:2ee762ea11b3 82
tgw 0:2ee762ea11b3 83
tgw 0:2ee762ea11b3 84 template<typename T, typename U>
tgw 0:2ee762ea11b3 85 bool operator==(const SecureAllocator<T>&, const SecureAllocator<U>&) {
tgw 0:2ee762ea11b3 86 return true;
tgw 0:2ee762ea11b3 87 }
tgw 0:2ee762ea11b3 88
tgw 0:2ee762ea11b3 89 template<typename T, typename U>
tgw 0:2ee762ea11b3 90 bool operator!=(const SecureAllocator<T>&, const SecureAllocator<U>&) {
tgw 0:2ee762ea11b3 91 return false;
tgw 0:2ee762ea11b3 92 }
tgw 0:2ee762ea11b3 93
tgw 0:2ee762ea11b3 94 } //namespace Json
tgw 0:2ee762ea11b3 95
tgw 0:2ee762ea11b3 96 #pragma pack(pop)
tgw 0:2ee762ea11b3 97
tgw 0:2ee762ea11b3 98 #endif // CPPTL_JSON_ALLOCATOR_H_INCLUDED