Home > Article > Backend Development > What\'s the Most Efficient Way to Concatenate Vectors in a Multithreaded Environment?
In multithreaded programming, the need to merge results from multiple threads arises frequently. A common scenario involves concatenating vectors containing data. The goal of this article is to determine the most efficient approach for performing this operation.
Suppose we have three vectors:
What is the most efficient way to achieve this?
The most efficient way to concatenate two vectors is to use the reserve() and insert() methods. The following code demonstrates this approach:
<code class="cpp">AB.reserve( A.size() + B.size() ); // preallocate memory AB.insert( AB.end(), A.begin(), A.end() ); AB.insert( AB.end(), B.begin(), B.end() );</code>
This approach is efficient because it avoids copying the vector elements and only requires a single memory allocation.
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