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Problem with copy construction of std::vector from Upp::Vector [message #43818]

Tue, 28 October 2014 15:32

masu
Messages: 378
Registered: February 2006

Senior Member

Hi,

when trying to copy construct std::vector from Upp::Vector like this:

Vector<int> v;
v << 1 << 2 << 3;
std::vector<int> std_v(v);

I get the following error:

error: invalid user-defined conversion from 'Upp::Vector<int>' to 'std::vector<int>::size_type {aka 
	long long unsigned int}' [-fpermissive]

std::vector constructor using iterators works well with Upp::Vector:

std::vector<int> siv(v.Begin(), v.End());

[EDIT]
Ok, the compiler takes another constructor with size_type argument since Upp::Vector is not a std::vector and therefore the copy constructor cannot be used.
It seems the easiest to use the std::vector constructor using iterators when one wants to copy an Upp::Vector to a std::vector or is there a simpler way of doing this?

Regards
Matthias

931b81e7ea53320dccc37375b34b38c3

[Updated on: Tue, 28 October 2014 18:33]

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Re: Problem with copy construction of std::vector from Upp::Vector [message #43821 is a reply to message #43818]

Wed, 29 October 2014 09:54

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

I think using iterators is the correct approach:

- we obviously cannot add a new copy contructor to std::vector
- it might be possible to add operator std::vector<T> to Vector, but that would be confusing at best (e.g. because of clone/pick semantics)
- besides, AFAIK vector does not have a copy constructor e.g. from deque or list, so this is the corresponding approach

Mirek

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