2d array initialisation

cocos2d-x C++
#1

hello guys, m stuck with the 2d array implementation through the vectors, since the CCArray has been deprecated but couldn’t find the suitable documentation regarding this…so plz help me out

#2

you can always use the stl to create an 2d array if that is what you need:

int myArray[3][5];

a 2d vector:

std::vector< std::vector<int> > myVector;
#3

i want to initialise not an int array but an object array. i know how to declare and initialise a 1d vector but only know the declaration for 2d vector and not the initialisation…

#4

So change int to your object?

#5

@slackmoehrle brother u didn’t get my question. I want the initialisation for the last line of your answer, i.e.- std::vector<std::vector> my vector;

#6

There are few different ways like:

std::vector<std::vector<int>> myVec(2, std::vector<int>(3, 4));

Or c++11

std::vector<std::vector<int>> fog {
        { 1, 2, 3 },
        { 4, 5, 6 }
    };
#7

@Edvinas and what exactly are 2,3 and 4 in your 1st example

#8

@CastorTroy786

2 - first vector dimension
3 - second vector dimension
4- default value

It looks like that:

[4] [4] [4]
[4] [4] [4]

1 Like
#9

@Edvinas thnx bru…but i did try the same thing prev too but didn’t get the result.
its like cocos2d::Vector<cocos2d::Vectorcocos2d::Sprite>_balls(row,cocos2d::Vectorcocos2d::Sprite(col,NULL))

and the compile time error is–>
No matching constructor for the initialisation of cocos2d::Vectorcocos2d::Sprite

any solution for this bur

#10

if you use cocos2d::Vector() you can only put items in it that are a type of cocos2d class.

stl::vecttor() can hold any type.

#11

isn’t sprite a type of cocos2d class, i.e–> cocos2d::sprite

#12

and moreover it is not picking stl whenever i try cocos2d is forced

#13

bd187fb7b8df7578.png2880×1800

have a look at it

#14

@Edvinas also tell me how to insert values in 2d vector through at method or if any other method available

#15

it works for me if I use an std::Vector

#16

d6bacbe5dbbc8c8b.png2880×1800

@slackmoehrle now what??

#17

@CastorTroy786

Well I don’t understand why are you doing it that way, it should work for you, but I don’t see point of doing that

std::vector <std::vector<cocos2d::Sprite>> myVec(4, std::vector<cocos2d::Sprite>(3, *cocos2d::Sprite::create()));

What is the point to initialise vector? Its dynamic you can push back sprites whenever you want. This is how I use vectors for storing sprites std::vector <std::vector <cocos2d::Sprite *>> _TopSprites; I push back pointer to sprite whenever I want and the if I need something I just go trough vector.

#18

@Edvinas ok i got your point that why to initialise when you can insert afterwards, but bro how to insert a 2d vector?? In case of 1d vector i know like _balls.insert(0,sprite);
or using pushback but can’t get any idea regarding this

#19

And how to retrieve too…

#20

i.e.–> using .at()