analogue for .push_back()?

[Edward Tang]

hello, new to the blaze library, currently translating over some cfd code to utilize it.

is there an equivalent to the std::vector .push_back() / pop_back() operation? I understand that blaze::DynamicVector v[i] = elem is similar, but you need to specify the index. Is there an appending operation that does not need an index?

[Klaus Iglberger]

Hi Edward!

Thanks for creating this proposal. No, currently blaze::DynamicVector does not provide anything similar to std::vector<T>::push_back() or std::vector<T>::insert(). The rational behind that is that blaze::DynamicVector is not considered a container, but a numerical vector, which usually doesn’t grow element-wise. However, you can implement a push_back() function yourself:

template< typename Type, bool TF, typename Alloc, typename Tag, typename T >
void push_back( blaze::DynamicVector<Type,TF,Alloc,Tag>& vec, T&& value )
{
   size_t const size = vec.size();

   vec.extend( 1, true );
   vec[size] = std::forward<T>(value);
}

int main()
{
   blaze::DynamicVector<int> vec{ 1, 2, 3, 4 };
   vec.reserve( 10 );  // Reserve more memory for future push_back() calls

   push_back( vec, 5 );  // vec = ( 1, 2, 3, 4, 5 )
   push_back( vec, 6 );  // vec = ( 1, 2, 3, 4, 5, 6 )
   // ...

   return EXIT_SUCCESS;
}

I hope this helps,

Best regards,

Klaus!