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diff --git a/tiger-compiler/src/ast/if-exp.hh b/tiger-compiler/src/ast/if-exp.hh
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+++ b/tiger-compiler/src/ast/if-exp.hh
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+/**
+ ** \file ast/if-exp.hh
+ ** \brief Declaration of ast::IfExp.
+ */
+
+#pragma once
+
+#include <ast/exp.hh>
+#include <ast/seq-exp.hh>
+
+namespace ast
+{
+  /// IfExp.
+  class IfExp : public Exp
+  {
+  public:
+    IfExp(const Location& location, Exp* test, Exp* thenclause)
+      : Exp(location)
+      , test_(test)
+      , thenclause_(thenclause)
+      , elseclause_(new SeqExp(location, new exps_type()))
+    {}
+
+  public:
+    /** \name Ctor & dtor.
+     ** \{ */
+    /// Construct an IfExp node.
+    IfExp(const Location& location,
+          Exp* test,
+          Exp* thenclause,
+          Exp* elseclause);
+    IfExp(const IfExp&) = delete;
+    IfExp& operator=(const IfExp&) = delete;
+    /// Destroy an IfExp node.
+    ~IfExp() 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 condition.
+    const Exp& test_get() const;
+    /// Return condition.
+    Exp& test_get();
+    /// Return instructions executed if condition is true.
+    const Exp& thenclause_get() const;
+    /// Return instructions executed if condition is true.
+    Exp& thenclause_get();
+    /// Return instructions executed if condition is false.
+    const Exp& elseclause_get() const;
+    /// Return instructions executed if condition is false.
+    Exp& elseclause_get();
+    /** \} */
+
+  protected:
+    /// Condition.
+    Exp* test_;
+    /// Instructions executed if condition is true.
+    Exp* thenclause_;
+    /// Instructions executed if condition is false.
+    Exp* elseclause_;
+  };
+} // namespace ast
+#include <ast/if-exp.hxx>