add FindIndex

stepmania/src/RageUtil.h

@@ -191,6 +191,15 @@ void SortCStringArray( CStringArray &AddTo, const bool bSortAcsending = true );
 float calc_mean(const float *start, const float *end);
 float calc_stddev(const float *start, const float *end);
 
+template<class T1, class T2>
+int FindIndex( const T1 &array, const T2 *p )
+{
+	T1::const_iterator it = find( array.begin(), array.end(), p );
+	if( it == array.end() )
+		return -1;
+	return it - array.begin();
+}
+
 void TrimLeft(CString &str, const char *s = "\r\n\t ");
 void TrimRight(CString &str, const char *s = "\r\n\t ");
 void StripCrnl(CString &s);