From: Mikko Rasa <tdb@tdb.fi>
Date: Sat, 20 Apr 2013 14:19:55 +0000 (+0300)
Subject: Add activation check to the rest of Filtered's virtual functions
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=43a7280153efb239d74a902200f0a10c47c5de7a

Add activation check to the rest of Filtered's virtual functions

This fixes a bug manifesting in builder where a put call that triggers a
BufferedFile's buffer flush causes the buffer contents to be written to
the file twice.
---

diff --git a/source/io/filtered.h b/source/io/filtered.h
index 0d323ec..a4a4319 100644
--- a/source/io/filtered.h
+++ b/source/io/filtered.h
@@ -4,6 +4,7 @@
 namespace Msp {
 namespace IO {
 
+// XXX This needs a redesign
 template<typename B, typename F>
 class Filtered: public B
 {
@@ -53,9 +54,32 @@ protected:
 	}
 
 public:
-	virtual unsigned put(char c) { return filter.put(c); }
-	virtual bool getline(std::string &l) { return filter.getline(l); }
-	virtual int get() { return filter.get(); }
+	virtual unsigned put(char c)
+	{
+		if(active)
+			return B::put(c);
+
+		Activator a(*this);
+		return filter.put(c);
+	}
+
+	virtual bool getline(std::string &l)
+	{
+		if(active)
+			return B::getline(l);
+
+		Activator a(*this);
+		return filter.getline(l);
+	}
+
+	virtual int get()
+	{
+		if(active)
+			return B::get();
+			
+		Activator a(*this);
+		return filter.get();
+	}
 
 	F &get_filter() { return filter; }
 };