SimplePullReader C++98 support

std::to_string can’t be used because it requires C++11.

example/simplepullreader/simplepullreader.cpp

 #include "rapidjson/reader.h"
 #include <iostream>
+#include <sstream>
 
 using namespace rapidjson;
 using namespace std;
 
+// If you can require C++11, you could use std::to_string here
+template <typename T> std::string stringify(T x) {
+    return (std::stringstream() << x).str();
+}
+
 struct MyHandler {
     const char* type;
     std::string data;
     
     bool Null() { type = "Null"; data.clear(); return true; }
     bool Bool(bool b) { type = "Bool:"; data = b? "true": "false"; return true; }
-    bool Int(int i) { type = "Int:"; data = std::to_string(i); return true; }
-    bool Uint(unsigned u) { type = "Uint:"; data = std::to_string(u); return true; }
-    bool Int64(int64_t i) { type = "Int64:"; data = std::to_string(i); return true; }
-    bool Uint64(uint64_t u) { type = "Uint64:"; data = std::to_string(u); return true; }
-    bool Double(double d) { type = "Double:"; data = std::to_string(d); return true; }
+    bool Int(int i) { type = "Int:"; data = stringify(i); return true; }
+    bool Uint(unsigned u) { type = "Uint:"; data = stringify(u); return true; }
+    bool Int64(int64_t i) { type = "Int64:"; data = stringify(i); return true; }
+    bool Uint64(uint64_t u) { type = "Uint64:"; data = stringify(u); return true; }
+    bool Double(double d) { type = "Double:"; data = stringify(d); return true; }
     bool RawNumber(const char* str, SizeType length, bool) { type = "Number:"; data = std::string(str, length); return true; }
     bool String(const char* str, SizeType length, bool) { type = "String:"; data = std::string(str, length); return true; }
     bool StartObject() { type = "StartObject"; data.clear(); return true; }
     bool Key(const char* str, SizeType length, bool) { type = "Key:"; data = std::string(str, length); return true; }
-    bool EndObject(SizeType memberCount) { type = "EndObject:"; data = std::to_string(memberCount); return true; }
+    bool EndObject(SizeType memberCount) { type = "EndObject:"; data = stringify(memberCount); return true; }
     bool StartArray() { type = "StartArray"; data.clear(); return true; }
-    bool EndArray(SizeType elementCount) { type = "EndArray:"; data = std::to_string(elementCount); return true; }
+    bool EndArray(SizeType elementCount) { type = "EndArray:"; data = stringify(elementCount); return true; }
 };
 
 int main() {