implement cpu

1 files changed, 44 insertions, 0 deletions

diff --git a/src/nes/mapper.hh b/src/nes/mapper.hh
new file mode 100644
index 0000000..0aec2ac
--- /dev/null
+++ b/src/nes/mapper.hh
@@ -0,0 +1,44 @@
+#pragma once
+
+#include "nes/util/address.hh"
+
+namespace nes
+{
+	class cartridge;
+
+	class mapper
+	{
+		using read_func = std::uint8_t(mapper::*)(address);
+		using write_func = void(mapper::*)(address, std::uint8_t);
+
+		cartridge& cartridge_;
+		read_func read_;
+		write_func write_;
+
+	public:
+		static auto select(cartridge&) -> mapper;
+
+		mapper(mapper const&) = delete;
+		mapper(mapper&&) = delete;
+		auto operator=(mapper const&) -> mapper& = delete;
+		auto operator=(mapper&&) -> mapper& = delete;
+
+		auto read(address const addr) -> std::uint8_t
+		{
+			return (this->*read_)(addr);
+		}
+
+		auto write(address const addr, std::uint8_t const value) -> void
+		{
+			(this->*write_)(addr, value);
+		}
+
+	private:
+		explicit mapper(cartridge& cartridge, read_func read, write_func write);
+
+		// Implementations
+
+		auto nrom_read(address) -> std::uint8_t;
+		auto nrom_write(address, std::uint8_t) -> void;
+	};
+} // namespace nes
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