Avoid some brain damage from Windows headers

[libs/gl.git] / source / tag.h

diff --git a/source/tag.h b/source/tag.h
index 87d4af656d9a8cea87969f7c966ac6d74d7fb26e..28b4fa010e8b0f12980df476f7ac8160a2c922fb 100644 (file)
--- a/source/tag.h
+++ b/source/tag.h
@@ -6,6 +6,10 @@
 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;
@@ -13,6 +17,9 @@ struct Tag
        Tag(): id(0) { }
        Tag(const char *);
        Tag(const std::string &s);
+
+       bool operator<(const Tag &t) const { return id<t.id; }
+       bool operator==(const Tag &t) const { return id==t.id; }
 };
 
 } // namespace GL