Creating a custom memory pool / memory allocator?

Question

Is it possible in C ++ to create a custom dispenser that works just like this:

{
    // Limit memory to 1024 KB
    ScopedMemoryPool memoryPool(1024 * 1024); 

    // From here on all heap allocations ('new', 'malloc', ...) take memory from the pool.
    // If the pool is depleted these calls result in an exception being thrown.

    // Examples:
    std::vector<int> integers(10);
    int a * = new int [10];
}

I could not find something like this in boost libraries or anywhere else.

Is there a fundamental problem that makes this impossible?

Answer 1

You will need to create a custom dispenser that you pass as a template parameter to the vector. This custom allocator will essentially wrap access to your pool and perform any size checks it wants.

Answer 2

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Answer 3

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Answer 4

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Answer 5

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Thus, when using staticor a global variable for its implementation, problems with multithreaded functions will arise. Otherwise, this is not a bad way to circumvent statelessness of distributors.

(Of course, you need to pass the second argument to the template, for example vector< int, UseScopedPool >.)