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diff --git a/tiger-compiler/src/type/function.hh b/tiger-compiler/src/type/function.hh
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+/**
+ ** \file type/function.hh
+ ** \brief The class Function.
+ */
+#pragma once
+
+#include <type/fwd.hh>
+#include <type/record.hh>
+#include <type/type.hh>
+
+namespace type
+{
+  /** \brief Function types.
+   **
+   ** Encapsulate the signature of a function, i.e. the type structures
+   ** of both function's arguments and its result.  */
+  class Function : public Type
+  {
+  public:
+    /** \brief Construct a Function.
+     **
+     ** \param formals type structures of formal arguments.
+     ** \param result type structure of what function returns. */
+    Function(const Record* formals, const Type& result);
+
+    /** \brief Destructor.
+     **/
+    ~Function() override;
+
+    /// \name Visitors entry point.
+    /** \{ */
+    /// Accept a const visitor \a v.
+    void accept(ConstVisitor& v) const override;
+    /// Accept a non-const visitor \a v.
+    void accept(Visitor& v) override;
+    /** \} */
+
+    /** \name Accessors.
+     ** \{ */
+    /// Return the type structures of the function's arguments.
+    const Record& formals_get() const;
+    /// Return the type structure of the function's result.
+    const Type& result_get() const;
+    /** \} */
+
+    // FIXME DONE: Some code was deleted here (Special implementation of "compatible_with" for Function).
+    bool compatible_with(const Type& other) const override;
+
+  protected:
+    /// Formals' types.
+    const Record* formals_;
+
+    /// Result's type.
+    const Type& result_;
+  };
+
+} // namespace type
+
+#include <type/function.hxx>