Cleaned up output/exception/asserts, etc after last merge

[bamtools.git] / src / api / BamIndex.h

diff --git a/src/api/BamIndex.h b/src/api/BamIndex.h
index b202e921ff9d13c56796469abef5550486241430..067244ec2d2fd845458d7868dbee553771388be7 100644 (file)
--- a/src/api/BamIndex.h
+++ b/src/api/BamIndex.h
@@ -78,14 +78,14 @@ class API_EXPORT BamIndex {
 
     // internal methods
     protected:
-        void SetErrorString(const std::string& where, const std::string& what) {
+        void SetErrorString(const std::string& where, const std::string& what) const {
             m_errorString = where + ": " + what;
         }
 
     // data members
     protected:
         Internal::BamReaderPrivate* m_reader; // copy, not owned
-        std::string m_errorString;
+        mutable std::string m_errorString;
 };
 
 } // namespace BamTools