start adding doctests

intcode/include/intcode/Machine.hpp

@@ -33,10 +33,13 @@ public:
   /// @param offset from base pointer
   /// @return reference to memory at given offset
   auto Rel(std::size_t offset) -> ValueType &;
+  auto Rel(std::size_t offset) const -> ValueType;
 
   auto Next() -> ValueType &;
   auto Goto(std::size_t address) -> void;
   auto Rebase(std::size_t offset) -> void;
+
+  auto Dump() const -> std::vector<ValueType>;
 };
 
 } // namespace

intcode/src/Machine.cpp

@@ -21,6 +21,10 @@ auto Machine::Rel(std::size_t const i) -> ValueType & {
   return At(base_ + i);
 }
 
+auto Machine::Rel(std::size_t const i) const -> ValueType {
+  return At(base_ + i);
+}
+
 auto Machine::Rebase(std::size_t const offset) -> void {
   base_ += offset;
 }
@@ -33,4 +37,21 @@ auto Machine::Goto(std::size_t const address) -> void {
   pc_ = address;
 }
 
+auto Machine::Dump() const -> std::vector<ValueType> {
+  if (ram_.empty()) { return rom_; }
+  
+  std::size_t size = rom_.size();
+  for (auto const& [k,v] : ram_) {
+    if (k >= size) { size = k+1; }
+  }
+
+  std::vector<ValueType> result(size);
+  std::copy(rom_.begin(), rom_.end(), result.begin());
+  for (auto const& [k,v] : ram_) {
+    result[k] = v;
+  }
+
+  return result;
+}
+
 } // namespace