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@d11wtq d11wtq/generics.cpp
Last active Aug 29, 2015

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class ASTNode {
template <class T> virtual T accept(Visitor<T> *visitor);
template <class T> class Visitor {
virtual T visit(CallNode *node) = 0;
virtual T visit(BinExprNode *node) = 0;
class Optimizer : public Visitor<ASTNode *> {
ASTNode *visit(BinExprNode *node) {
ASTNode *optimizedL = <ASTNode *>node->left()->accept(this);
ASTNode *optimizedR = <ASTNode *>node->right()->accept(this);
return new BinExprNode(optimizedL, node->op(), optimizedR);
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