bsnes-hd/bsnes/sfc/memory/writable.hpp

struct WritableMemory : Memory {
  inline auto reset() -> void override {
    delete[] self.data;
    self.data = nullptr;
    self.size = 0;
  }

  inline auto allocate(uint size, uint8 fill = 0xff) -> void override {
    if(self.size != size) {
      delete[] self.data;
      self.data = new uint8[self.size = size];
    }
    for(uint address : range(size)) {
      self.data[address] = fill;
    }
  }

  inline auto data() -> uint8* override {
    return self.data;
  }

  inline auto size() const -> uint override {
    return self.size;
  }

  inline auto read(uint address, uint8 data = 0) -> uint8 override {
    return self.data[address];
  }

  inline auto write(uint address, uint8 data) -> void override {
    self.data[address] = data;
  }

  inline auto operator[](uint address) -> uint8& {
    return self.data[address];
  }

private:
  struct {
    uint8* data = nullptr;
    uint size = 0;
  } self;
};