Convert DITLs to JSON

rapidjson/example/sortkeys/sortkeys.cpp

@@ -0,0 +1,62 @@
+#include "rapidjson/document.h"
+#include "rapidjson/filewritestream.h"
+#include <rapidjson/prettywriter.h>
+
+#include <algorithm>
+#include <iostream>
+
+using namespace rapidjson;
+using namespace std;
+
+static void printIt(const Value &doc) {
+    char writeBuffer[65536];
+    FileWriteStream os(stdout, writeBuffer, sizeof(writeBuffer));
+    PrettyWriter<FileWriteStream> writer(os);
+    doc.Accept(writer);
+    cout << endl;
+}
+
+struct NameComparator {
+    bool operator()(const Value::Member &lhs, const Value::Member &rhs) const {
+        return (strcmp(lhs.name.GetString(), rhs.name.GetString()) < 0);
+    }
+};
+
+int main() {
+    Document d(kObjectType);
+    Document::AllocatorType &allocator = d.GetAllocator();
+
+    d.AddMember("zeta", Value().SetBool(false), allocator);
+    d.AddMember("gama", Value().SetString("test string", allocator), allocator);
+    d.AddMember("delta", Value().SetInt(123), allocator);
+    d.AddMember("alpha", Value(kArrayType).Move(), allocator);
+
+    printIt(d);
+
+/*
+{
+    "zeta": false,
+    "gama": "test string",
+    "delta": 123,
+    "alpha": []
+}
+*/
+
+// C++11 supports std::move() of Value so it always have no problem for std::sort().
+// Some C++03 implementations of std::sort() requires copy constructor which causes compilation error.
+// Needs a sorting function only depends on std::swap() instead.
+#if __cplusplus >= 201103L || (!defined(__GLIBCXX__) && (!defined(_MSC_VER) || _MSC_VER >= 1900))
+    std::sort(d.MemberBegin(), d.MemberEnd(), NameComparator());
+
+    printIt(d);
+
+/*
+{
+  "alpha": [],
+  "delta": 123,
+  "gama": "test string",
+  "zeta": false
+}
+*/
+#endif
+}