global.set has been implemented, but not diff xmit for globals

luprex/cpp/core/util.hpp

@@ -328,10 +328,35 @@ struct XYZ {
     eng::string debug_string() const;
 };
 
-class NullStreamBuffer : public std::streambuf
-{
+// util::ostringstream
+//
+// This is a variant of ostringstream in which it is possible
+// to get the contents without copying.   To get the contents
+// without copying, use oss.view().
+//
+class ostringstream : public eng::ostringstream {
+    class rstringbuf : public std::basic_stringbuf<char_type, traits_type, allocator_type> {
+    public:
+        char *eback() const { return std::streambuf::eback(); }
+        char *pptr() const { return std::streambuf::pptr(); }
+    };
+    rstringbuf rstringbuf_;
 public:
-  int overflow(int c) { return c; }
+    ostringstream() {
+        std::basic_ostream<char>::rdbuf(&rstringbuf_);
+    }
+    char *data() const {
+        return rstringbuf_.eback();
+    }
+    size_t size() const {
+        return rstringbuf_.pptr() - rstringbuf_.eback();
+    }
+    std::string_view view() const {
+        return std::string_view(data(), size());
+    }
+    eng::string str() const {
+        return rstringbuf_.str();
+    }
 };
 
 // send_to_stream: send all arguments to the specified stream.
@@ -350,34 +375,7 @@ inline eng::string ss(const ARGS & ... args) {
     return oss.str();
 }
 
-// util::ostringstream
-//
-// This is a variant of ostringstream in which it is possible
-// to get the contents without copying.   To get the contents
-// without copying, use oss.view().
-//
-class ostringstream : public eng::ostringstream {
-    class rstringbuf : public std::basic_stringbuf<char_type, traits_type, allocator_type> {
-    public:
-        char *eback() const { return std::streambuf::eback(); }
-        char *pptr() const { return std::streambuf::pptr(); }
-    };
-    rstringbuf rstringbuf_;
-public:
-    ostringstream() {
-        std::basic_ostream<char>::rdbuf(&rstringbuf_);
-    }
-    std::string_view view() const {
-        char *p = rstringbuf_.eback();
-        size_t size = rstringbuf_.pptr() - p;
-        return std::string_view(p, size);
-    }
-    eng::string str() const {
-        return rstringbuf_.str();
-    }
-};
-
-// dprintf
+// dprintf / dprint
 //
 // Send a debugging message to somewhere that it can be seen. This routine
 // initially just sends output to stderr.  But it can be hooked to send output
@@ -388,8 +386,16 @@ public:
 // characters only.  There will be no control characters.  The newline is
 // implied. 
 //
+void dprintview(std::string_view view);
 void dprintf(const char *format, ...);
-void hook_dprintf(void (*func)(const char *oneline));
+void hook_dprint(void (*func)(const char *oneline, size_t size));
+
+template <class... ARGS>
+inline void dprint(const ARGS & ... args) {
+    util::ostringstream oss;
+    send_to_stream(oss, args...);
+    dprintview(oss.view());
+}
 
 // A better API than std::setfill, std::hex, std::setw, std::setprecision
 //