libalvalue

What is ALValue?

ALValue is a variant used by ALCommon.

It is a recursive type. An ALValue can be:

• an int
• a bool
• a float
• a string
• an array of ALValue objects

#include <iostream>
#include <alvalue/alvalue.h>

using namespace AL;

int main()
{

  // Create an array of 2 ints and a string
  ALValue val;
  val.arrayPush(1);
  val.arrayPush(2);
  val.arrayPush("hello");

  // For debugging purposes:
  std::cout << "val: " << val.toString() << std::endl;

  /*
  Or:
  ALValue val;
  val.setSize(3);
  val[0] = 1;
  val[1] = 2;
  val[2] = "hello";
  */


  // Read two ints and a string from an ALValue:
  int a, b;
  std::string c;
  a = (int) val[0];
  b = (int) val[1];
  c = (std::string) val[2];

  std::cout << "a : " << a << std::endl
            << "b : " << b << std::endl
            << "c : " << c << std::endl;

  return 0;
}

limitations

• It's not easy to store maps in ALValue. You have to do something like a list of lists of 2 elements (key, value).
• The type double is not supported
• Some automatic conversions from std::vector to ALValue work, but not all of them (std::vector<int> and std::vector<float> works, but not std::vector<std::string> and std::vector<bool>)
• There are other limitations when using ALValue from other languages:
  • The conversion from ALValue to a Python type is locale-dependant
  • Not all types of ALValue are supported in Java

Reference

• AL::ALValue

Extras