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/*
* This file is part of PowerDNS or dnsdist.
* Copyright -- PowerDNS.COM B.V. and its contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* In addition, for the avoidance of any doubt, permission is granted to
* link this program with OpenSSL and to (re)distribute the binaries
* produced as the result of such linking.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef LAZY_ALLOCATOR_HH
#define LAZY_ALLOCATOR_HH
#include <cstddef>
#include <utility>
#include <type_traits>
template <typename T>
struct lazy_allocator {
using value_type = T;
using pointer = T*;
using size_type = std::size_t;
static_assert (std::is_trivial<T>::value,
"lazy_allocator must only be used with trivial types");
pointer
allocate (size_type const n) {
return static_cast<pointer>(::operator new (n * sizeof(value_type)));
}
void
deallocate (pointer const ptr, size_type const n) noexcept {
#if defined(__cpp_sized_deallocation) && (__cpp_sized_deallocation >= 201309)
::operator delete (ptr, n * sizeof(value_type));
#else
(void) n;
::operator delete (ptr);
#endif
}
void construct (T*) const noexcept {}
template <typename X, typename... Args>
void
construct (X* place, Args&&... args) const noexcept {
new (static_cast<void*>(place)) X (std::forward<Args>(args)...);
}
};
template <typename T> inline
bool operator== (lazy_allocator<T> const&, lazy_allocator<T> const&) noexcept {
return true;
}
template <typename T> inline
bool operator!= (lazy_allocator<T> const&, lazy_allocator<T> const&) noexcept {
return false;
}
#endif // LAZY_ALLOCATOR_HH
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