recreate(reassign) a std::shared_ptr or std::unique_ptr

Question

I want to have a managed pointer (unique or shared) and be able to reassign it with new piece of memory and also be sure that old memory is deleted (as it's supposed to be) with managed pointers.

struct MyStruct
{
       MyStruct(signed int) { }
       MyStruct(unsigned float) { }
};
std::unique_ptr<MyStruct> y(new MyStruct(-4)); // int instance
std::shared_ptr<MyStruct> x(new MyStruct(-5));

// do something with x or y
//...


// until now pointers worked as "int" next we want to change it to work as float

x = new MyStruct(4.443);
y = new MyStruct(3.22); // does not work

How would I achieve this in most clean way?

There's no such thing as an unsigned float, just float works. You should also use new MyStruct(4.443f) to avoid an ambiguous call issue since 4.443 is a double and can be converted to either an int or float. — Retired Ninja
– Retired Ninja, Commented Jul 26, 2014 at 7:37

Daniel Frey · Accepted Answer · 2014-07-26 07:32:22Z

6

You have several options:

x = std::unique_ptr<MyStruct>(new MyStruct(4.443));
x = std::make_unique<MyStruct>(4.443); // C++14
x.reset(new MyStruct(4.443));

y = std::shared_ptr<MyStruct>(new MyStruct(3.22));
y = std::make_shared<MyStruct>(3.22);
y.reset(new MyStruct(3.22));

answered Jul 26, 2014 at 7:32

Daniel Frey

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