Add CPU and Memory class for SNES emulator

src/app/emu/mem.h

@@ -0,0 +1,45 @@
+#ifndef MEM_H
+#define MEM_H
+
+// memory.h
+class Memory {
+ public:
+  virtual ~Memory() = default;
+  virtual uint8_t ReadByte(uint16_t address) const = 0;
+  virtual uint16_t ReadWord(uint16_t address) const = 0;
+  virtual uint32_t ReadWordLong(uint16_t address) const = 0;
+  virtual void SetMemory(const std::vector<uint8_t>& data) = 0;
+
+  virtual uint8_t operator[](int i) const = 0;
+  virtual uint8_t at(int i) const = 0;
+};
+
+class MemoryImpl : public Memory {
+ public:
+  uint8_t ReadByte(uint16_t address) const override {
+    return memory_.at(address);
+  }
+  uint16_t ReadWord(uint16_t address) const override {
+    return static_cast<uint16_t>(memory_.at(address)) |
+           (static_cast<uint16_t>(memory_.at(address + 1)) << 8);
+  }
+  void SetMemory(const std::vector<uint8_t>& data) override { memory_ = data; }
+
+  uint8_t at(int i) const override { return memory_[i]; }
+  auto size() const { return memory_.size(); }
+  auto begin() const { return memory_.begin(); }
+  auto end() const { return memory_.end(); }
+
+  uint8_t operator[](int i) const override {
+    if (i > memory_.size()) {
+      std::cout << i << " out of bounds \n";
+      return memory_[0];
+    }
+    return memory_[i];
+  }
+
+  // Memory (64KB)
+  std::vector<uint8_t> memory_;
+};
+
+#endif  // MEM_H