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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/util/memory_allocator.h>
namespace vespalib {
/**
* std compliant allocator that will use a smart allocator
* that uses mmap prefering huge pages for large allocations.
* This is a good fit for use with std::vector and std::deque.
*/
template <typename T>
class allocator_large {
public:
allocator_large() noexcept : _allocator(alloc::MemoryAllocator::select_allocator()) {}
using value_type = T;
constexpr T * allocate(std::size_t n) {
return static_cast<T *>(_allocator->alloc(n*sizeof(T)).get());
}
void deallocate(T * p, std::size_t n) {
_allocator->free(p, n*sizeof(T));
}
const alloc::MemoryAllocator * allocator() const { return _allocator; }
private:
const alloc::MemoryAllocator * _allocator;
};
template< class T1, class T2 >
constexpr bool operator==( const allocator_large<T1>& lhs, const allocator_large<T2>& rhs ) noexcept {
return lhs.allocator() == rhs.allocator();
}
}
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