You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.4 KiB
90 lines
2.4 KiB
// Copyright 2007-2010 Baptiste Lepilleur and The JsonCpp Authors
|
|
// Distributed under MIT license, or public domain if desired and
|
|
// recognized in your jurisdiction.
|
|
// See file LICENSE for detail or copy at http://jsoncpp.sourceforge.net/LICENSE
|
|
|
|
#ifndef JSON_ALLOCATOR_H_INCLUDED
|
|
#define JSON_ALLOCATOR_H_INCLUDED
|
|
|
|
#include <cstring>
|
|
#include <memory>
|
|
|
|
#pragma pack(push, 8)
|
|
|
|
namespace Json {
|
|
template <typename T> class SecureAllocator {
|
|
public:
|
|
// Type definitions
|
|
using value_type = T;
|
|
using pointer = T*;
|
|
using const_pointer = const T*;
|
|
using reference = T&;
|
|
using const_reference = const T&;
|
|
using size_type = std::size_t;
|
|
using difference_type = std::ptrdiff_t;
|
|
|
|
/**
|
|
* Allocate memory for N items using the standard allocator.
|
|
*/
|
|
pointer allocate(size_type n) {
|
|
// allocate using "global operator new"
|
|
return static_cast<pointer>(::operator new(n * sizeof(T)));
|
|
}
|
|
|
|
/**
|
|
* Release memory which was allocated for N items at pointer P.
|
|
*
|
|
* The memory block is filled with zeroes before being released.
|
|
* The pointer argument is tagged as "volatile" to prevent the
|
|
* compiler optimizing out this critical step.
|
|
*/
|
|
void deallocate(volatile pointer p, size_type n) {
|
|
std::memset(p, 0, n * sizeof(T));
|
|
// free using "global operator delete"
|
|
::operator delete(p);
|
|
}
|
|
|
|
/**
|
|
* Construct an item in-place at pointer P.
|
|
*/
|
|
template <typename... Args> void construct(pointer p, Args&&... args) {
|
|
// construct using "placement new" and "perfect forwarding"
|
|
::new (static_cast<void*>(p)) T(std::forward<Args>(args)...);
|
|
}
|
|
|
|
size_type max_size() const { return size_t(-1) / sizeof(T); }
|
|
|
|
pointer address(reference x) const { return std::addressof(x); }
|
|
|
|
const_pointer address(const_reference x) const { return std::addressof(x); }
|
|
|
|
/**
|
|
* Destroy an item in-place at pointer P.
|
|
*/
|
|
void destroy(pointer p) {
|
|
// destroy using "explicit destructor"
|
|
p->~T();
|
|
}
|
|
|
|
// Boilerplate
|
|
SecureAllocator() {}
|
|
template <typename U> SecureAllocator(const SecureAllocator<U>&) {}
|
|
template <typename U> struct rebind { using other = SecureAllocator<U>; };
|
|
};
|
|
|
|
template <typename T, typename U>
|
|
bool operator==(const SecureAllocator<T>&, const SecureAllocator<U>&) {
|
|
return true;
|
|
}
|
|
|
|
template <typename T, typename U>
|
|
bool operator!=(const SecureAllocator<T>&, const SecureAllocator<U>&) {
|
|
return false;
|
|
}
|
|
|
|
} // namespace Json
|
|
|
|
#pragma pack(pop)
|
|
|
|
#endif // JSON_ALLOCATOR_H_INCLUDED
|