In my main function I create an array of objects of a certain class "Menu"
And when I call a function I want to provide a pointer to that array.
Menu menu[2];
// Create menu [0], [1]
Function(POINTER_TO_ARRAY);
Question: What is the correct way to write the Function parameters?
I try:
Function(&menu);
and in Header file:
void Function(Menu *menu[]); // not working
error: Cannot convert parameter 1 from Menu(*)[2] to Menu *[]
void Function(Menu * menu); // not working
error: Cannot convert parameter 1 from Menu(*)[2] to Menu *[]
and I can't come up with any other way to do this and I can't find a solution to this particular problem.
Simply, I want to be able to access the Menu array within the function through a pointer. What are the difference in normal pointer to a pointer to an array?
Declaration:
void Function(Menu* a_menus); // Arrays decay to pointers.
Invocation:
Function(menu);
However, you would need to inform Function()
how many entries are in the array. As this is C++ suggest using std::array
or std::vector
which have knowledge of their size, beginning and end:
std::vector<Menu> menus;
menus.push_back(Menu("1"));
menus.push_back(Menu("2"));
Function(menus);
void Function(const std::vector<Menu>& a_menus)
{
std::for_each(a_menus.begin(),
a_menus.end(),
[](const Menu& a_menu)
{
// Use a_menu
});
}
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