What\'s the Most Efficient Way to Append One Vector to Another in C ?

Appending Vectors with Efficiency

When dealing with vectors, a common task involves appending one vector to another. While there's a straightforward way to achieve this through repeated insertions, it's not the most efficient approach.

For efficient vector concatenation, C offers the insert method. Assuming you have two vectors a and b, you can seamlessly append b to a as follows:

a.insert(a.end(), b.begin(), b.end());

This code snippet utilizes insert to insert the entire range of elements from b into a at the position specified by a.end().

Alternatively, you can use the C 11-compliant std::begin and std::end functions to achieve the same result:

a.insert(std::end(a), std::begin(b), std::end(b));

This variant is more generic and can be used with arrays as well as vectors.

For even greater flexibility, you can employ ADL (Argument-Dependent Lookup) with user-defined types:

using std::begin, std::end;
a.insert(end(a), begin(b), end(b));

In summary, insert provides an efficient and convenient way to append vectors in C , enabling you to work with extended vector sequences with ease.

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