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C++ autoload default constructor on object property


C++ autoload default constructor on object property

By : Adam Basa
Date : October 18 2020, 06:10 PM
I think the issue was by ths following ,
If TileMap has no arguments on constructor there is no problem, but I added three arguments and WorldMapState automatically tries to create an object with empty constructor. Why C++ works in that way?
code :
public:
    TileMap();
    TileMap(unsigned int width, unsigned int height, unsigned int tileSize);
public:
    TileMap(unsigned int width = 0, unsigned int height = 0, unsigned int tileSize = 0);
private:
    // ...
    TileMap _tilemap{0, 0, 0};
WorldMapState::WorldMapState(GameDataRef data)
    : _tilemap(0, 0, 0)
{
    // ...
}


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Why constructor property of object points to parent's constructor instead of F in extend function if constructor propert

Why constructor property of object points to parent's constructor instead of F in extend function if constructor propert


By : Avidyut Noobroot
Date : March 29 2020, 07:55 AM
Does that help If a member can't be found on an instance then JS engine will look in the prototype chain. The prototype chain is a bunch of objects that have a __proto__ of another object until it's null.
Please note that __proto__ is a non standard property and used here to explain the object first used in the prototype chain.
code :
child.prototype.constructor=child;
insance of child (new c())
  => c.prototype === new F() so an empty object
    => p.prototype, set when you did F.prototype=parent.prototype
How to set default value for property in a Scenario object (constructor not called!)

How to set default value for property in a Scenario object (constructor not called!)


By : Swaroop
Date : March 29 2020, 07:55 AM
it fixes the issue Cucumber uses XStream to convert step definition arguments to Java objects, so to answer this we have to dig in XStream's methods for doing this.
As mentioned on this answer to an XStream question, one option is to use the readResolve method (which XStream apparently uses if available, to set up the object.
code :
ScenarioStuff{
private String Name;
private Boolean happy;

private Object readResolve() {
        if(happy == null){
            happy = true;
        }
        return this;
  }
}
How can I set a default property for an object that's passed into a constructor?

How can I set a default property for an object that's passed into a constructor?


By : Jesus Alvarado
Date : March 29 2020, 07:55 AM
seems to work fine I'm trying to make a change in one spot to affect the config object passed into all instantiations of an object. The object is made available globally as follows: , You can either decorate the constructor:
code :
function Crayons(){
  function fooWithDefaults() {
    3rdPartyFoo.apply(this, arguments); // this is what you're looking for
    if (!this.color) // or whatever to detect "not set"
      this.color = "blue";
  }
  fooWithDefaults.prototype = 3rdPartyFoo.prototype; // to make `new` work

  return {
    foo: fooWithDefaults
  }
}
function Crayons(){
  function fooWithDefaults(arg) {
    var that = new 3rdPartyFoo(arg); // you should know how many arguments it takes
    if (!that.color) // or whatever to detect "not set"
      that.color = "blue";
    return that;
  }

  return {
    foo: fooWithDefaults
  }
}
function Crayons(){
  function fooWithDefaults(arg) {
    if (!arg.color) // or whatever to detect "not set"
      arg.color = "blue";
    return new 3rdPartyFoo(arg);
  }

  return {
    foo: fooWithDefaults
  }
}
Fatal error: Constructor Autoload::autoload() cannot be static in C:\xampp\htdocs\project\autoload.php on line 3

Fatal error: Constructor Autoload::autoload() cannot be static in C:\xampp\htdocs\project\autoload.php on line 3


By : Vasya Vsaya
Date : March 29 2020, 07:55 AM
may help you . Your method name matches your class name -- this is PHP's old style of defining a constructor. Just change the name of either the class or the method so that they don't match.
code :
class Autoload
{
    public static function load($className) {
        $className = strtolower($className);
        require_once $className.".php";
    }
}
spl_autoload_register("Autoload::load");
cannot deserialize from Object value (no delegate- or property-based Creator) even with default constructor present

cannot deserialize from Object value (no delegate- or property-based Creator) even with default constructor present


By : christain.o57
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further EDIT:
I just found a much better solution, add the ParanamerModule to the ObjectMapper:
code :
mapper.registerModule(new ParanamerModule());
<dependency>
    <groupId>com.fasterxml.jackson.module</groupId>
    <artifactId>jackson-module-paranamer</artifactId>
    <version>${jackson.version}</version>
</dependency>
public class Operator {

    private String operator;

    public Operator(String operator) {
        this.operator = operator;
    }

    public String getOperator() {
        return operator;
    }
}
ObjectMapper mapper = new ObjectMapper();
mapper.setVisibility(PropertyAccessor.ALL, Visibility.NONE);
mapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY);
mapper.setVisibility(PropertyAccessor.CREATOR, Visibility.ANY);

String value = mapper.writeValueAsString(new Operator("test"));
Operator result = mapper.readValue(value, Operator.class);
{"operator":"test"}
com.fasterxml.jackson.databind.exc.MismatchedInputException: 
Cannot construct instance of `...Operator` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (String)"{"operator":"test"}"; line: 1, column: 2]
public class Operator {

    private String operator;

    private Operator() {
    }

    public Operator(String operator) {
        this();
        this.operator = operator;
    }

    public String getOperator() {
        return operator;
    }
}
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