introduce string_view

examples/book_server/book_json.cc

@@ -16,7 +16,7 @@ Json::Value StringToJson(const std::string& str) {
   Json::Value json;
 
   Json::CharReaderBuilder builder;
-  std::stringstream stream(str);
+  std::istringstream stream{ str };
   std::string errs;
   if (!Json::parseFromStream(builder, stream, &json, &errs)) {
     std::cerr << errs << std::endl;

examples/book_server/main.cc

@@ -39,11 +39,11 @@ int main(int argc, char* argv[]) {
                  std::make_shared<BookListView>(),
                  { "GET", "POST" });
 
-    server.Route(webcc::R("/books/(\\d+)"),
+    server.Route(webcc::R{ "/books/(\\d+)" },
                  std::make_shared<BookDetailView>(photo_dir),
                  { "GET", "PUT", "DELETE" });
 
-    server.Route(webcc::R("/books/(\\d+)/photo"),
+    server.Route(webcc::R{ "/books/(\\d+)/photo" },
                  std::make_shared<BookPhotoView>(photo_dir),
                  { "GET", "PUT", "DELETE" });