use <iosfwd> in header

firewave · firewave · commit ca9de3847dc4 · 2024-07-12T16:36:42.000+02:00
diff --git a/simplecpp.cpp b/simplecpp.cpp
@@ -22,6 +22,7 @@
 #include <exception>
 #include <fstream>
 #include <iostream>
+#include <istream>
 #include <limits>
 #include <list>
 #include <map>
diff --git a/simplecpp.h b/simplecpp.h
@@ -8,7 +8,7 @@
 
 #include <cctype>
 #include <cstring>
-#include <istream>
+#include <iosfwd>
 #include <list>
 #include <map>
 #include <set>
