On Thursday, 17 October 2019 at 14:45:24 UTC, Mil58 wrote:
Hi all...
Does exist (or not?) a way to create array with several types
(as in Python)
You actually have at least three options for handling mixed data:
```
// Three ways to handle mixed data
import std.stdio;
import std.typecons;
import std.variant;
struct Result
{
string itemName;
int quantity;
bool needIt;
} // struct Result
class GroceryItem
{
private:
bool _needIt;
int _quantity;
string _itemName;
public:
this(string itemName, int quantity, bool needIt)
{
_itemName = itemName;
_quantity = quantity;
_needIt = needIt;
} // this()
Variant getVariant()
{
return(cast(Variant)tuple(_itemName, _quantity, _needIt)); //
use with a Variant return type
} // getVariant()
Tuple!(string, int, bool)getTuple()
{
return(tuple(_itemName, _quantity, _needIt)); // use with a
Tuple!(string, int, bool) return type
} // getTuple()
Result getStruct()
{
Result result = {_itemName, _quantity, _needIt};
return(result);
} // getStruct()
void set(bool needIt)
{
_needIt = needIt;
} // set()
} // class GroceryItem
void main(string[] args)
{
GroceryItem[] groceryList;
GroceryItem item1 = new GroceryItem("Paper Towels", 1, true);
groceryList ~= item1;
GroceryItem item2 = new GroceryItem("Bread", 2, true);
groceryList ~= item2;
GroceryItem item3 = new GroceryItem("Butter", 1, false);
groceryList ~= item3;
GroceryItem item4 = new GroceryItem("Milk", 1, true);
groceryList ~= item4;
GroceryItem item5 = new GroceryItem("Potato Chips", 3, false);
groceryList ~= item5;
GroceryItem item6 = new GroceryItem("Pickles", 4, true);
groceryList ~= item6;
writeln("Returning variants...");
foreach(groceryItem; groceryList)
{
writeln(groceryItem.getVariant());
}
writeln();
writeln("Returning tuples...");
foreach(groceryItem; groceryList)
{
writeln(groceryItem.getTuple());
}
writeln();
writeln("Returning structs...");
foreach(groceryItem; groceryList)
{
writeln(groceryItem.getStruct());
}
} // main()
```
