module util;

import std.format;
import std.json;

void optional(T)(ref JSONValue val, string key, ref T receiver) {
  const(JSONValue)* p = key in val;

  if (p == null)
    return;

  static if (is(JSONValue == T))
    receiver = *p;
  else
    receiver = (*p).get!T;
}

T optional(T)(ref JSONValue val, string key) {
  T t;
  optional(val, key, t);
  return t;
}

void required(T)(ref JSONValue val, string key, ref T receiver) {
  receiver = val[key].get!T;
}