add SegmentCache class

Makefile

@@ -1,8 +1,8 @@
-CXXFLAGS=-g
+CXXFLAGS=-g -std=c++11
 
 all: v6502
 
-v6502: v6502.o cpu.o nodes.o
+v6502: v6502.o cpu.o nodes.o SegmentCache.o
 	g++ $^ -o $@
 
 v6502.o: v6502.cpp cpu.h addressbus.h
@@ -11,6 +11,8 @@ cpu.o: cpu.cpp cpu.h addressbus.h nodes.h
 
 nodes.o: nodes.cpp nodes.h
 
+SegmentCache.o : SegmentCache.cpp SegmentCache.h
+
 clean:
 	-rm *.o
 	-rm v6502

SegmentCache.cpp

@@ -0,0 +1,19 @@
+/* 
+ * File:   SegmentCache.cpp
+ * Author: cmosher
+ * 
+ * Created on December 10, 2013, 9:56 PM
+ */
+
+#include "SegmentCache.h"
+#include <string>
+#include <map>
+#include <memory>
+#include <algorithm>
+
+Segment* SegmentCache::getOrAdd(std::string& id) {
+    if (this->cache.find(id) == this->cache.end()) {
+        this->cache[id] = std::make_shared<Segment>(id);
+    }
+    return this->cache[id].get();
+}

SegmentCache.h

@@ -0,0 +1,30 @@
+/* 
+ * File:   SegmentCache.h
+ * Author: Christopher
+ *
+ * Created on December 10, 2013, 9:56 PM
+ */
+
+#ifndef SEGMENTCACHE_H
+#define	SEGMENTCACHE_H
+
+#include "trans.h"
+#include <memory>
+#include <string>
+#include <map>
+
+class SegmentCache {
+public:
+    SegmentCache() {}
+    virtual ~SegmentCache() {}
+
+    Segment* getOrAdd(std::string& id);
+
+private:
+    std::map<std::string,std::shared_ptr<Segment>> cache;
+
+    SegmentCache(const SegmentCache&);
+    SegmentCache& operator=(const SegmentCache&);
+};
+
+#endif	/* SEGMENTCACHE_H */

trans.h

@@ -22,6 +22,9 @@ public:
     bool pullup;
     bool pulldown;
     bool on;
+
+    Segment(std::string& id) : id(id) {
+    }
 };
 
 class Trans {