Better/prettier way to copy from one set to another?

[Jim Langston]

I normally do my own iterations using containers, but have been striving to
learn the standard algorithms and use them. One one point in my code I
simply want to elements from one set into another. This is what I was able
to piece together copying the elements from std::set<size_t> Triangles to
std::set<size_t> SelectedSet:

std::copy( Triangles.begin(), Triangles.end(),
std::insert_iterator<std::set<size_t> >( SelectedSet,
SelectedSet.begin() ) );

std::insert_iterator<std::set<size_t> >( SelectedSet, SelectedSet.begin() )
is a mouthful. Is there a simpler way?

 

[werasm]

I normally do my own iterations using containers, but have been striving to
learn the standard algorithms and use them. One one point in my code I
simply want to elements from one set into another. This is what I was able
to piece together copying the elements from std::set<size_t> Triangles to
std::set<size_t> SelectedSet:

std::copy( Triangles.begin(), Triangles.end(),
std::insert_iterator<std::set<size_t> >( SelectedSet,
SelectedSet.begin() ) );

std::insert_iterator<std::set<size_t> >( SelectedSet, SelectedSet.begin() )
is a mouthful. Is there a simpler way?

std::inserter( SelectedSet, SelectedSet.begin() );

//...
#include <set>
#include <iterator>

int main()
{
std::set<int> s1;
std::set<int> s2;

std::copy(
s1.begin(), s1.end(),
std::inserter( s2, s2.begin() ) );
return 0;
}

Regards,

Werner

 

[Jim Langston]

std::inserter( SelectedSet, SelectedSet.begin() );

//...
#include <set>
#include <iterator>

int main()
{
std::set<int> s1;
std::set<int> s2;

std::copy(
s1.begin(), s1.end(),
std::inserter( s2, s2.begin() ) );
return 0;
}

Ahh, thanks. I had tried std::back_inserter and was getting an error that
set didn't have .push_back. So many inserters. Thanks again.

 

[Jeff F]

I normally do my own iterations using containers, but have been striving to
learn the standard algorithms and use them. One one point in my code I
simply want to elements from one set into another. This is what I was able
to piece together copying the elements from std::set<size_t> Triangles to
std::set<size_t> SelectedSet:

std::copy( Triangles.begin(), Triangles.end(),
std::insert_iterator<std::set<size_t> >( SelectedSet,
SelectedSet.begin() ) );

std::insert_iterator<std::set<size_t> >( SelectedSet,
SelectedSet.begin() )
is a mouthful. Is there a simpler way?

std::set<std::size_t> SelectedSet( Triangles );

Jeff Flinn