JSON Cpp Object Size Limits?

[sajidraza]

Are there any hard limits in JSONCPP with respect to object size (other than memory available on the heap)?

I wrote a really simple program to experiment with large objects in JSONCPP (see code below). I hit a limit WRT objects at ~400MB.

include

include <json/json.h>

include

include

int main(int argc, char** argv) {
int count = std::atoi(argv[1]);
int messages = 100000000;

for (int i=0; i<count; ++i) {
Json::Value root(Json::arrayValue);

for (int j=0; j<messages; ++j) {
  Json::Value& security = root.append(Json::Value(Json::objectValue));
  security["symbol"] = "msft.o";
  security["price"] = 27.0;
  security["fair"] = 27.0;
}

Json::FastWriter writer;
std::cout << writer.write(root);

}
}

[cdunn2001]

There is no hard-coded limit. It uses STL data-structures, so it's possible that resizing the vector requires extra memory temporarily.