null_alloc.hpp

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#ifndef EAGINE_MEMORY_NULL_ALLOC_HPP
#define EAGINE_MEMORY_NULL_ALLOC_HPP
 
#include "../assert.hpp"
#include "byte_alloc.hpp"
 
namespace eagine::memory {
 
template <typename Policy = default_byte_allocator_policy>
class null_byte_allocator
  : public byte_allocator_impl<Policy, null_byte_allocator> {
public:
    using size_type = span_size_t;
 
    auto equal(byte_allocator* a) const noexcept -> bool override {
        return dynamic_cast<null_byte_allocator*>(a) != nullptr;
    }
 
    auto max_size(size_type) noexcept -> size_type override {
        return 0;
    }
 
    auto has_allocated(const owned_block&, size_type) noexcept
      -> tribool override {
        return indeterminate;
    }
 
    auto allocate(size_type, size_type) noexcept -> owned_block override {
        return {};
    }
 
    void deallocate(owned_block&& b, size_type) noexcept override {
        EAGINE_ASSERT(b.empty());
    }
};
 
} // namespace eagine::memory
 
#endif // EAGINE_MEMORY_NULL_ALLOC_HPP