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Add void specialization of RuleFn template

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This commit is contained in:
Max Brunsfeld 2015-01-17 14:10:56 -08:00
parent 7a71d91fb6
commit 68a0e16d1e
1 changed files with 53 additions and 0 deletions
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53
src/compiler/rules/visitor.h
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@ -90,6 +90,59 @@ class RuleFn : private Visitor {
T value_;
};
template <>
class RuleFn<void> : private Visitor {
public:
void apply(const rule_ptr &rule) {
rule->accept(this);
}
protected:
virtual void default_apply(const Rule *rule) {}
virtual void apply_to(const Blank *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const CharacterSet *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const Choice *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const Metadata *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const Pattern *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const Repeat *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const Seq *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const String *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const NamedSymbol *rule) {
return default_apply((const Rule *)rule);
}
virtual void apply_to(const Symbol *rule) {
return default_apply((const Rule *)rule);
}
void visit(const Blank *rule) { apply_to(rule); }
void visit(const CharacterSet *rule) { apply_to(rule); }
void visit(const Choice *rule) { apply_to(rule); }
void visit(const Metadata *rule) { apply_to(rule); }
void visit(const Pattern *rule) { apply_to(rule); }
void visit(const Repeat *rule) { apply_to(rule); }
void visit(const Seq *rule) { apply_to(rule); }
void visit(const String *rule) { apply_to(rule); }
void visit(const NamedSymbol *rule) { apply_to(rule); }
void visit(const Symbol *rule) { apply_to(rule); }
};
class IdentityRuleFn : public RuleFn<rule_ptr> {
protected:
virtual rule_ptr default_apply(const Rule *rule);