How Can I Use Chromium\'s Stack Container Library for Stack-Based Vector Allocation?

Stack-Based Vector Class: An Alternative to STL's Heap Allocation

Problem:

Developers often seek a vector-like class that utilizes stack storage instead of heap allocation for efficient data handling. This article explores an existing solution for this need within the Chromium framework.

Solution:

Instead of creating a custom vector class, Chromium provides a convenient way to allocate STL vectors on the stack using its stack_container.h library. This approach avoids the overhead associated with heap allocation, thereby enhancing performance.

Usage:

The Chromium stack container library includes a class called StackVector. To employ this class, developers can simply pass the stack buffer size as a template parameter to create a stack-based vector. For instance, the following code allocates a vector with a capacity of 128 elements on the stack:

<code class="cpp">StackVector<int, 128> s;</code>

The stack vector can be used like a regular STL vector, allowing for easy addition and retrieval of elements. To access the underlying STL container, developers can use the container() method:

<code class="cpp">StackVector<int, 128>::ContainerType & v = s.container();</code>

Benefits:

Using Chromium's stack_container.h library simplifies the creation of stack-based vector classes. It provides a drop-in replacement for STL vectors, eliminating the need to adopt new interfaces or modify existing code.

Additional Notes:

Chromium originally introduced a StackVector class in stack_container.h, but it lacked compatibility with STL vectors. Developers seeking a stack-based vector class that inherits from STL's vector without the need for custom overrides can explore other options or consider implementing their own solution.

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