character player;C/C++ passing structure through functions
Author
I have a struct named 'character' and it has a few variables in it, in my main program i create an instance of the struct with
In C, you would pass the argument using a pointer, like this (not compiled or tested):
void set_up_player(character* player){ assert(player); player->x = 0; player->y = 0; /* Etc. */}void set_up_player(character& player){ player.x = 0; player.y = 0; // Etc.}
C or C++? Which is it?
In C:
This is using pointers. A pointer contains the address of an object - in this case, character* means a pointer to a character object. So when we call Foo, we use the & operator to get the memory address of the variable player, and give that to Foo. Foo then uses that memory address to modify the object itself (using the -> operator).
In C++, prefer references:
EDIT: Ninja'd.
In C:
void Foo(character* p){ p->bar = 0;}/* ... */character player;Foo(&player);This is using pointers. A pointer contains the address of an object - in this case, character* means a pointer to a character object. So when we call Foo, we use the & operator to get the memory address of the variable player, and give that to Foo. Foo then uses that memory address to modify the object itself (using the -> operator).
In C++, prefer references:
void Foo(character& p){ p.bar = 0;}/* ... */character player;Foo(player);EDIT: Ninja'd.
Author
thank you very much for your help, it was exactly what I needed. Just a question: what is the
assert(player);This topic is closed to new replies.
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