Add Fl_String not-equal test

2 files changed, 14 insertions, 0 deletions

diff --git a/src/Fl_String.H b/src/Fl_String.H
index d10d75b6c..e7fbf49eb 100644
--- a/src/Fl_String.H
+++ b/src/Fl_String.H
@@ -135,6 +135,7 @@ public:
 FL_EXPORT Fl_String operator+(const Fl_String& lhs, const Fl_String& rhs);
 FL_EXPORT Fl_String operator+(const Fl_String& lhs, const char* rhs);
 FL_EXPORT bool operator==(const Fl_String & lhs, const Fl_String & rhs);
+FL_EXPORT bool operator!=(const Fl_String & lhs, const Fl_String & rhs);
 
 /**
 \}
diff --git a/src/Fl_String.cxx b/src/Fl_String.cxx
index 8fd8e5f51..60d50ef99 100644
--- a/src/Fl_String.cxx
+++ b/src/Fl_String.cxx
@@ -646,6 +646,19 @@ bool operator==(const Fl_String &lhs, const Fl_String &rhs) {
 }
 
 /**
+ Compare two strings for inequality.
+ \param[in] lhs first string
+ \param[in] rhs second string
+ \return true if strings differ in size or content
+ */
+bool operator!=(const Fl_String &lhs, const Fl_String &rhs) {
+  if (lhs.size() != rhs.size()) return true;
+  int sz = lhs.size();  // same size for both
+  if (memcmp(lhs.data(), rhs.data(), sz) != 0) return true;
+  return false;
+}
+
+/**
 \}
 \endcond
 */