/*
Copyright (C) 2012, University of Cambridge, Department of Psychiatry.
Created by Rudolf Cardinal (rnc1001@cam.ac.uk).
This file is part of CamCOPS.
CamCOPS is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
CamCOPS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with CamCOPS. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <limits> // for std::numeric_limits
#include <new> // for std::bad_alloc
#include <QtGlobal> // for Q_UNUSED
// Currently unused.
template <typename T>
struct zallocator
{
public:
typedef T value_type;
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
pointer address (reference v) const {return &v;}
const_pointer address (const_reference v) const {return &v;}
pointer allocate (size_type n, const void* hint = nullptr) {
Q_UNUSED(hint)
if (n > std::numeric_limits<size_type>::max() / sizeof(T))
throw std::bad_alloc();
return static_cast<pointer> (::operator new (n * sizeof (value_type)));
}
void deallocate(pointer p, size_type n) {
OPENSSL_cleanse(p, n*sizeof(T));
::operator delete(p);
}
size_type max_size() const {
return std::numeric_limits<size_type>::max() / sizeof (T);
}
template<typename U>
struct rebind
{
typedef zallocator<U> other;
};
void construct (pointer ptr, const T& val) {
new (static_cast<T*>(ptr) ) T (val);
}
void destroy(pointer ptr) {
static_cast<T*>(ptr)->~T();
}
#if __cplusplus >= 201103L
template<typename U, typename... Args>
void construct (U* ptr, Args&& ... args) {
::new (static_cast<void*> (ptr) ) U (std::forward<Args> (args)...);
}
template<typename U>
void destroy(U* ptr) {
ptr->~U();
}
#endif
};