65 lines
1.4 KiB
C++
65 lines
1.4 KiB
C++
#ifndef INTCODE_HPP_
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#define INTCODE_HPP_
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#include <cstddef>
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#include <cstdint>
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#include <istream>
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#include <unordered_map>
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#include <stdexcept>
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#include <variant>
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#include <vector>
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template <class... Ts> struct overloaded : Ts... { using Ts::operator()...; };
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template <class... Ts> overloaded(Ts...) -> overloaded<Ts...>;
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namespace intcode {
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using ValueType = std::int64_t;
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struct Input {
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ValueType &pos;
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};
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struct Output {
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ValueType val;
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};
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struct Halt {};
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class Machine {
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std::vector<ValueType> rom_;
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std::unordered_map<std::size_t, ValueType> ram_;
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std::size_t pc_;
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std::size_t base_;
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public:
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Machine();
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explicit Machine(std::vector<ValueType> ram);
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/// Access memory at absolute address
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/// @param address
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/// @return reference to memory at given address
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auto At(std::size_t address) -> ValueType &;
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/// Access memory at address relative to base pointer
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/// @param offset from base pointer
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/// @return reference to memory at given offset
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auto Rel(std::size_t offset) -> ValueType &;
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auto Next() -> ValueType &;
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auto Goto(std::size_t address) -> void;
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auto Rebase(std::size_t offset) -> void;
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};
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auto Step(Machine & m) -> std::variant<Input, Output, Halt>;
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struct BadInstruction : public std::runtime_error {
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explicit BadInstruction(char const* what);
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};
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auto ParseStream(std::istream &in) -> std::vector<ValueType>;
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}
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#endif // INTCODE_HPP_
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