Diff: jsoncpp/include/json/allocator.h

Revision:

0:2ee762ea11b3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jsoncpp/include/json/allocator.h	Fri Jan 26 06:05:31 2018 +0000
@@ -0,0 +1,98 @@
+// 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 CPPTL_JSON_ALLOCATOR_H_INCLUDED
+#define CPPTL_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 // CPPTL_JSON_ALLOCATOR_H_INCLUDED