memory_resource.h

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#pragma once

 
#include "fl/stl/int.h"
#include "fl/stl/noexcept.h"
 
namespace fl {

class memory_resource {
  public:
    virtual ~memory_resource() FL_NOEXCEPT = default;
 
    void* allocate(fl::size bytes) FL_NOEXCEPT {
        if (bytes == 0) return nullptr;
        return do_allocate(bytes);
    }
 
    void deallocate(void* p, fl::size bytes) FL_NOEXCEPT {
        if (!p) return;
        do_deallocate(p, bytes);
    }

    void* reallocate(void* p, fl::size old_bytes, fl::size new_bytes) FL_NOEXCEPT {
        if (new_bytes == 0) {
            deallocate(p, old_bytes);
            return nullptr;
        }
        if (!p) return allocate(new_bytes);
        return do_reallocate(p, old_bytes, new_bytes);
    }
 
    bool is_equal(const memory_resource& other) const FL_NOEXCEPT {
        return do_is_equal(other);
    }
 
  protected:
    virtual void* do_allocate(fl::size bytes) FL_NOEXCEPT = 0;
    virtual void do_deallocate(void* p, fl::size bytes) FL_NOEXCEPT = 0;

    virtual void* do_reallocate(void* p, fl::size old_bytes, fl::size new_bytes) FL_NOEXCEPT;
 
    virtual bool do_is_equal(const memory_resource& other) const FL_NOEXCEPT {
        return this == &other;
    }
};

memory_resource* default_memory_resource() FL_NOEXCEPT;

memory_resource* psram_memory_resource() FL_NOEXCEPT;
 
} // namespace fl