allocator_null.h

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#ifndef CPPCOMMON_MEMORY_ALLOCATOR_NULL_H
#define CPPCOMMON_MEMORY_ALLOCATOR_NULL_H
 
#include "allocator.h"
 
namespace CppCommon {
 
 
class NullMemoryManager
{
public:
    NullMemoryManager() noexcept : _allocated(0), _allocations(0) {}
    NullMemoryManager(const NullMemoryManager&) = delete;
    NullMemoryManager(NullMemoryManager&&) = delete;
    ~NullMemoryManager() noexcept { reset(); }
 
    NullMemoryManager& operator=(const NullMemoryManager&) = delete;
    NullMemoryManager& operator=(NullMemoryManager&&) = delete;
 
    size_t allocated() const noexcept { return _allocated; }
    size_t allocations() const noexcept { return _allocations; }
 
    size_t max_size() const noexcept { return std::numeric_limits<size_t>::max(); }
 
 
    void* malloc(size_t size, size_t alignment = alignof(std::max_align_t));
 
    void free(void* ptr, size_t size);
 
    void reset();
 
private:
    // Allocation statistics
    size_t _allocated;
    size_t _allocations;
};
 
template <typename T, bool nothrow = false>
using NullAllocator = Allocator<T, NullMemoryManager, nothrow>;
 
} // namespace CppCommon
 
#include "allocator_null.inl"
 
#endif // CPPCOMMON_MEMORY_ALLOCATOR_NULL_H