similiar class to one in java

[drsmooth]

i was wondering if there is anything in c++ that resembles a java 'arraylist'

and arraylist works exactly like an array excpet you can keep changing its size without causing any problems


thanks,
ken

[sicarie]

I would suggest looking into vectors.

[Cucumber]

i was wondering if there is anything in c++ that resembles a java 'arraylist'

and arraylist works exactly like an array excpet you can keep changing its size without causing any problems


thanks,
ken

Sounds like a C++ vector to me.

#include <vector>
...
vector< int > foo;
foo.push_back(10);
int bar = foo[0];

Edit: Sorry, I wasnt aware it was already answered

[sicarie]

Edit: Sorry, I wasnt aware it was already answered

I think I snuck it in right before you did :)

[drsmooth]

i looked into vectors in a book i borrowed from one of my teachers, is it so that you can only remove or things from the end?

i need to be able to remove pieces from the middle of the list...

[Ganon11]

A vector allows random access (e.g. getting stuff from the middle of the list) and random removal (e.g. deleting stuff from the middle of the list). Just get an iterator to a certain point in the list, the call the vectors .erase method.

[drsmooth]

would the .erase method be like

vct.erase(index);

??

[sicarie]

The documentation for the erase method can be found in the link I posted...

And the erase method could have been found there as well...

[drsmooth]

ok, that was my bad lol i didnt notice that there was a link there.

nevertheless, i still have a question:
could someone post and example of adding a class that i created into a vector?

lets say a "Civilian class into a vector<Civilian>

Civilian c();
people.push_back(c);

that is what i tried whereby i got:

[C++ Error] Keep.cpp(49): E2285 Could not find a match for 'vector<Civilian,allocator<Civilian> >::push_back(Civilian (*)())'

[Ganon11]

When you instantiate an object without parameters, do not use parentheses. The compiler thought you were declaring a function that returned a Civilian. Instead use:

Civilian c;

[drsmooth]

ok thank you.

i havd one more side question along with this one:

in java concatenateing an int to a string was a as simple as like:
string s;
int num = 0;
s = "num: "+num;

when i do that in c++ and try to cout the string it comes up with a wierd picture like a smiley face or something...

is it something i am doing wrong?

[Ganon11]

It probably interprets the integer value as an ASCII value and tries to append that character. Try:

s = "num= " + static_cast<char>(num);

[drsmooth]

now i get even stranger resutls:

this line:

name = "Unnamed Civilian: "+ static_cast<char>(myID);

appears in a civilian class and name is a string.
when i cout the strings of successive civilians, i get these results:

Unnamed Civilian
nnamed Civilian
named Civilian
amed Civilian
med Civilian
ed Civilian
d Civilian
ect...

the value in myID comes from a static int, nextID which starts at 0 and then nextID++ every time a number is used...

i assume it has something to do with how i concatenate the string because a cout of the myID values yields:

0
1
2
3
4
5
6
7
8
9