使用std :: vector管理映射内存（glMapBuffer） [英] Manage mapped memory (glMapBuffer) with std::vector

问题描述

我发现，用std :: vector来管理一系列映射内存（来自glMapBuffer）是一个好主意。

it occurred to me that it would be a good idea to manage a range of mapped memory (from glMapBuffer) with a std::vector.

// map data to ptr
T* dataPtr = (T*)glMapBuffer(this->target, access);

[... debug code ...]

// try to construct a std::vector from dataPtr
T* dataPtrLast = dataPtr + size;
mappedVector = new std::vector<T>(dataPtr, dataPtrLast);

问题是内存范围不会直接使用，而是复制到向量中。

the problem is that the memory range won't be used directly but it is copied into the vector.

我的问题是：是否可以使向量只使用映射的内存范围。 （理想情况下，在调整大小/保留时抛出异常）
或者是否有其他标准容器可以实现这一点？

My question would be: is it possible to make the vector just 'use' the mapped memory range. (and ideally throw exceptions on resize/reserve) Or is there any other standard container that would accomplish this?

/ p>

Kind Regards, Florian

推荐答案

不，很好。这段代码永远不会工作。例如，您可以更改MapBuffer并中断向量中的大小/容量值。您可以推入向量并导致访问冲突/分段故障。您可能会导致调整大小，销毁缓冲区。而且，根本上，如果它已经在一个连续的数组，有什么好处？您可以为固定长度的数组滚动自定义容器。

No, and for good reason. This code would never work. For example, you could alter the MapBuffer and break the size/capacity values inside the vector. You could push into the vector and cause an access violation/segmentation fault. You could cause a resize, destroying the buffer. And, fundamentally, if it's already within a contiguous array, what's the benefit? You could roll a custom container for fixed length arrays, I guess.

特别！如果你已经有一对指针来作为迭代器。

Especially! if you already have a pair of pointers to act like iterators.

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