Factor out base/indented_stream.h

base/indented_stream.h

@@ -0,0 +1,48 @@
+#ifndef BASE_INDENTED_STREAM_H
+#define BASE_INDENTED_STREAM_H
+
+#include <iostream>
+
+//----------------------------------------------------------------
+
+namespace {
+	class indented_stream {
+	public:
+		indented_stream(std::ostream &out)
+		: out_(out),
+		  indent_(0) {
+		}
+
+		void indent() {
+			for (unsigned i = 0; i < indent_ * 2; i++)
+				out_ << ' ';
+		}
+
+		void inc() {
+			indent_++;
+		}
+
+		void dec() {
+			indent_--;
+		}
+
+		template <typename T>
+		indented_stream &operator <<(T const &t) {
+			out_ << t;
+			return *this;
+		}
+
+		indented_stream &operator <<(std::ostream &(*fp)(std::ostream &)) {
+			out_ << fp;
+			return *this;
+		}
+
+	private:
+		std::ostream &out_;
+		unsigned indent_;
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif