From 2a3bb62001965837a5af7371ccae227d6a7bfac2 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Tue, 18 Jul 2017 18:01:50 +0100
Subject: [PATCH] Add efficient hasTag check to Package.

Avoids copying the tags set each time to check for presence / absence
of a particular tag.
---
 simgear/package/Package.cxx | 5 +++++
 simgear/package/Package.hxx | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/simgear/package/Package.cxx b/simgear/package/Package.cxx
index 17772f94..f802f6b3 100644
--- a/simgear/package/Package.cxx
+++ b/simgear/package/Package.cxx
@@ -268,6 +268,11 @@ string_set Package::tags() const
 {
     return m_tags;
 }
+    
+bool Package::hasTag(const std::string& tag) const
+{
+    return m_tags.find(tag) != m_tags.end();
+}
 
 SGPropertyNode* Package::properties() const
 {
diff --git a/simgear/package/Package.hxx b/simgear/package/Package.hxx
index 544ffb5c..0c5daa6c 100644
--- a/simgear/package/Package.hxx
+++ b/simgear/package/Package.hxx
@@ -142,6 +142,13 @@ public:
 
     string_set tags() const;
 
+    /**
+     * @brief hasTag - efficently check if a tag is defined or not
+     * @param tag
+     * @return
+     */
+    bool hasTag(const std::string& tag) const;
+    
     /**
      * download URLs for the package
      */