Dynamically allocated memory

[spare grotto]

Can someone explain why dynamically allocated memory is useful and give a code example?

[heady flume]

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[wise viper]

A good example is probably related to user input.
E.g. the user can input a number of elements of some kind. Could be really anything. From the amount of players in a game or just other kind of data
As you don't know the size at the moment you compile your program you can just allocate the space at runtime

int PlayerAmount;
std::cout << "How many players are there: ";
std::cin >> PlayerAmount;

Player* players = new Player[PlayerAmount];
// do stuff and once you don't need them anymore you release the space you took
delete[] players;

But usually you would not write it like this as we already have tools provided by the C++ standard library.
That's a good case for std::vector<Player>. This does this work under the hood

[modest saddle]

Not a code example, but imagine you need a very large matrix in your code. if you don't define it using dynamic memory allocation, it will by default allocate memory on the stack - which is limited, so your code might segfault because the matrix is too large

in that case you need to allocate memory on the heap using dynamic memory allocation

like Yinsei mentioned, anything you don't know the size of at compile time should be dynamically allocated

[spare grotto]

Ah, I understand. Thank you guys !

!solved

[heady flume]

[SOLVED] Dynamically allocated memory

[heady flume]

Dynamically allocated memory