operand: Use pure virtual functions

src/literal_number.cpp

@@ -22,16 +22,16 @@ void LiteralNumber::Fetch(Stream& stream) const {
     }
 }
 
-u16 LiteralNumber::GetWordCount() const {
+u16 LiteralNumber::GetWordCount() const noexcept {
     return is_32 ? 1 : 2;
 }
 
-bool LiteralNumber::operator==(const Operand& other) const {
+bool LiteralNumber::operator==(const Operand& other) const noexcept {
-    if (GetType() == other.GetType()) {
+    if (!EqualType(other)) {
+        return false;
+    }
     const auto& o{static_cast<const LiteralNumber&>(other)};
     return o.raw == raw && o.is_32 == is_32;
-    }
-    return false;
 }
 
 } // namespace Sirit

src/literal_number.h

@@ -13,15 +13,16 @@
 
 namespace Sirit {
 
-class LiteralNumber : public Operand {
+class LiteralNumber final : public Operand {
 public:
     explicit LiteralNumber(u64 raw, bool is_32);
     ~LiteralNumber() override;
 
     void Fetch(Stream& stream) const override;
-    u16 GetWordCount() const override;
 
-    bool operator==(const Operand& other) const override;
+    u16 GetWordCount() const noexcept override;
+
+    bool operator==(const Operand& other) const noexcept override;
 
     template <typename T>
     static std::unique_ptr<LiteralNumber> Create(T value) {

src/literal_string.cpp

@@ -19,15 +19,15 @@ void LiteralString::Fetch(Stream& stream) const {
     stream.Write(string);
 }
 
-u16 LiteralString::GetWordCount() const {
+u16 LiteralString::GetWordCount() const noexcept {
     return static_cast<u16>(string.size() / 4 + 1);
 }
 
-bool LiteralString::operator==(const Operand& other) const {
+bool LiteralString::operator==(const Operand& other) const noexcept {
-    if (GetType() == other.GetType()) {
+    if (!EqualType(other)) {
-        return static_cast<const LiteralString&>(other).string == string;
-    }
         return false;
+    }
+    return static_cast<const LiteralString&>(other).string == string;
 }
 
 } // namespace Sirit

src/literal_string.h

@@ -12,18 +12,19 @@
 
 namespace Sirit {
 
-class LiteralString : public Operand {
+class LiteralString final : public Operand {
 public:
     LiteralString(std::string string);
     ~LiteralString() override;
 
     void Fetch(Stream& stream) const override;
-    u16 GetWordCount() const override;
 
-    bool operator==(const Operand& other) const override;
+    u16 GetWordCount() const noexcept override;
+
+    bool operator==(const Operand& other) const noexcept override;
 
 private:
-    const std::string string;
+    std::string string;
 };
 
 } // namespace Sirit

src/op.cpp

@@ -25,12 +25,12 @@ void Op::Fetch(Stream& stream) const {
     stream.Write(id.value());
 }
 
-u16 Op::GetWordCount() const {
+u16 Op::GetWordCount() const noexcept {
     return 1;
 }
 
-bool Op::operator==(const Operand& other) const {
+bool Op::operator==(const Operand& other) const noexcept {
-    if (GetType() != other.GetType()) {
+    if (!EqualType(other)) {
         return false;
     }
     const auto& op = static_cast<const Op&>(other);

src/op.h

@@ -14,15 +14,16 @@
 
 namespace Sirit {
 
-class Op : public Operand {
+class Op final : public Operand {
 public:
     explicit Op(spv::Op opcode, std::optional<u32> id = {}, Id result_type = nullptr);
     ~Op() override;
 
     void Fetch(Stream& stream) const override;
-    u16 GetWordCount() const override;
 
-    bool operator==(const Operand& other) const override;
+    u16 GetWordCount() const noexcept override;
+
+    bool operator==(const Operand& other) const noexcept override;
 
     void Write(Stream& stream) const;
 

src/operand.cpp

@@ -13,25 +13,4 @@ Operand::Operand(OperandType operand_type) : operand_type{operand_type} {}
 
 Operand::~Operand() = default;
 
-void Operand::Fetch([[maybe_unused]] Stream& stream) const {
-    assert(!"Fetching unimplemented operand");
-}
-
-u16 Operand::GetWordCount() const {
-    assert(!"Fetching unimplemented operand");
-    return 0;
-}
-
-bool Operand::operator==([[maybe_unused]] const Operand& other) const {
-    return false;
-}
-
-bool Operand::operator!=(const Operand& other) const {
-    return !(*this == other);
-}
-
-OperandType Operand::GetType() const {
-    return operand_type;
-}
-
 } // namespace Sirit

src/operand.h

@@ -17,16 +17,22 @@ public:
     explicit Operand(OperandType operand_type);
     virtual ~Operand();
 
-    virtual void Fetch(Stream& stream) const;
+    virtual void Fetch(Stream& stream) const = 0;
-    virtual u16 GetWordCount() const;
 
-    virtual bool operator==(const Operand& other) const;
+    virtual u16 GetWordCount() const noexcept = 0;
-    bool operator!=(const Operand& other) const;
 
-    OperandType GetType() const;
+    virtual bool operator==(const Operand& other) const noexcept = 0;
+
+    bool operator!=(const Operand& other) const noexcept {
+        return !operator==(other);
+    }
+
+    bool EqualType(const Operand& other) const noexcept {
+        return operand_type == other.operand_type;
+    }
 
 private:
-    OperandType operand_type{};
+    OperandType operand_type;
 };
 
 } // namespace Sirit