Added is_undefined method.

9 years ago · feebade357
parent 0dc3cd6da4
commit feebade357
1 changed files with 4 additions and 0 deletions
--- a/peglib.h
+++ b/peglib.h
@ -67,6 +67,10 @@ public:
        delete content_;
    }

+    bool is_undefined() const {
+        return content_ == nullptr;
+    }
+
    template <typename T>
    T& get() {
        assert(content_);