X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Ftag.h;fp=source%2Fcore%2Ftag.h;h=dbc0b3ef47819470b17440642650dc9e6ee76ce4;hb=fa2b4c8a93ebad2497cacfdeaa9a2c20be486520;hp=0000000000000000000000000000000000000000;hpb=20622e74de6753c5e4460a112c11ee913707e8e8;p=libs%2Fgl.git

diff --git a/source/core/tag.h b/source/core/tag.h
new file mode 100644
index 00000000..dbc0b3ef
--- /dev/null
+++ b/source/core/tag.h
@@ -0,0 +1,34 @@
+#ifndef MSP_GL_TAG_H_
+#define MSP_GL_TAG_H_
+
+#include <string>
+#include <msp/strings/lexicalcast.h>
+
+namespace Msp {
+namespace GL {
+
+/**
+Provides transparent string-to-hash conversion for faster comparison.  An empty
+string is guaranteed to have an id of 0.
+*/
+struct Tag
+{
+	unsigned id;
+
+	Tag(): id(0) { }
+	Tag(const char *);
+	Tag(const std::string &s);
+
+	std::string str() const;
+
+	bool operator<(Tag t) const { return id<t.id; }
+	bool operator==(Tag t) const { return id==t.id; }
+	bool operator!=(Tag t) const { return id!=t.id; }
+};
+
+void operator<<(LexicalConverter &, Tag);
+
+} // namespace GL
+} // namespace Msp
+
+#endif