Use string::append in implementations of xml_writer

The current code is not optimal; since users actually read samples/tests
change them to use faster (and shorter!) code.

1 files changed, 1 insertions, 1 deletions

diff --git a/docs/samples/save_custom_writer.cpp b/docs/samples/save_custom_writer.cpp
index 9e9ee34..fe08b72 100644
--- a/docs/samples/save_custom_writer.cpp
+++ b/docs/samples/save_custom_writer.cpp
@@ -11,7 +11,7 @@ struct xml_string_writer: pugi::xml_writer
 
     virtual void write(const void* data, size_t size)
     {
-        result += std::string(static_cast<const char*>(data), size);
+        result.append(static_cast<const char*>(data), size);
     }
 };
 //]