MCF question

[Anderson Jogie]

Do anyone know how to convert a vector to a list in Visual C++? I tried casting, it does not work for me.

[Maximilien]

Are you talking about a std::vector and a std::list ? Don't think there is a direct conversion, you will need to copy from one to the other.

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[Anderson Jogie]

Yes : std::vector to std::list What is the best method to copy the data? Can you give an example? Thanks.

[David Crow]

It's not MFC, but something like:

vector<int> vec;
vector<int>::iterator it;
list<int> l;

for (it = vec.begin(); it != vec.end(); it++)
l.push_back(*it);

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"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

[Maximilien]

I'm not an STL expert, but after a quick google (bing did not give valid answers in the first few pages), here are a couple of solutions (adapt to your particular situation)

std::copy (v.begin (), v.end (), std::back_inserter (l))

or

std::list<int> l(v.begin(), v.end());

or ...

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[Dustin Henry]

Just so you know, std::vector and std::list have nothing to do with MFC. They are part of STL or Standard Template Library and are cross platform.

[Anderson Jogie]

I forget to mention it's two different data types see code below: std::list TempRes; TempRes.clear; std::vector::iterator it; for (it = TempResList.begin(); it != TempResList.end(); it++) TempRes.push_back(*it); Thanks the help on this.

[Anderson Jogie]

Well I guess it did not compile fully earlier, I am still getting the compiler error message below when I tried to copied the data from a vector to a list. ompiling... FSSCHED.CPP c:\program files\ilps\code\fstool\fssched.cpp(1165) : error C2664: 'push_back' : cannot convert parameter 1 from 'class RDLTemporaryResource *' to 'class RDLResource *const & ' Reason: cannot convert from 'class RDLTemporaryResource *' to 'class RDLResource *const ' Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast Error executing cl.exe. fstool.dll - 1 error(s), 0 warning(s)

[David Crow]

That's because your list is for RDLResource* objects while your iterator for that list is for RDLTemporaryResource* objects.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

[Anderson Jogie]

Right. So I am having problems transferring the data from the vector to the list. How do I work around doing that in my case? I tied casting, it compiled but the application crashes at runtime. Thanks.

[David Crow]

Anderson Jogie wrote:

How do I work around doing that in my case?

That's impossible to tell since I know nothing of either of those two classes. For example, how would you copy a vector of Automobile objects to a list of Animal objects?

Anderson Jogie wrote:

I tied casting, it compiled but the application crashes at runtime.

That would not work unless the two classes had a "is a" relationship.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

[Jim Crafton]

DavidCrow wrote:

That would not work unless the two classes had a "is a" relationship.

Reading that it occurred to me that a more casual (possibly less informed) reader might look at that, pause, and then have their head explode. :)

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[Jim Crafton]

So you binged it, but it bonged out?

¡El diablo está en mis pantalones! ¡Mire, mire! SELECT * FROM User WHERE Clue > 0 0 rows returned Save an Orange - Use the VCF! Personal 3D projects Just Say No to Web 2 Point Oh

[David Crow]

I agree. :doh:

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons