jsoncpp 升级1.9.5

Signed-off-by: zt147369 <zhangting201@huawei.com>

example/readFromString/readFromString.cpp

@@ -1,6 +1,6 @@
 #include "json/json.h"
-#include <cstdlib>
 #include <iostream>
+#include <memory>
 /**
  * \brief Parse a raw string into Value object using the CharReaderBuilder
  * class, or the legacy Reader class.
@@ -11,9 +11,9 @@
  * 20
  */
 int main() {
-  const std::string rawJson = "{\"Age\": 20, \"Name\": \"colin\"}";
-  const int rawJsonLength = static_cast<int>(rawJson.length());
-  JSONCPP_CONST bool shouldUseOldWay = false;
+  const std::string rawJson = R"({"Age": 20, "Name": "colin"})";
+  const auto rawJsonLength = static_cast<int>(rawJson.length());
+  constexpr bool shouldUseOldWay = false;
   JSONCPP_STRING err;
   Json::Value root;
 
@@ -22,13 +22,12 @@ int main() {
     reader.parse(rawJson, root);
   } else {
     Json::CharReaderBuilder builder;
-    Json::CharReader* reader(builder.newCharReader());
+    const std::unique_ptr<Json::CharReader> reader(builder.newCharReader());
     if (!reader->parse(rawJson.c_str(), rawJson.c_str() + rawJsonLength, &root,
                        &err)) {
       std::cout << "error" << std::endl;
       return EXIT_FAILURE;
     }
-    delete reader;
   }
   const std::string name = root["Name"].asString();
   const int age = root["Age"].asInt();