c++ - max_size返回一个大于或等于该类型容器所能容纳的最大元素数的值?
迷茫
迷茫 2017-04-17 12:07:46
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这是c++ primer中讲到容器大小一节时说的一句话,什么叫大于最大值?感觉错的太离谱了吧
英文版如下:
and max_size returns a number that is greater than or equal to the number of elements a container of that type can contain.

迷茫
迷茫

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迷茫

Checked the DevDocs, it is defined as follows on the std::vector::max_size entry max_size:

Returns the maximum number of elements the container is able to hold due to system or library implementation limitations,...

However, Notes mentioned:

This value is typically equal to std::numeric_limits<size_type>::max(), and reflects the theoretical limit on the size of the container. At runtime, the size of the container may be limited to a value smaller than max_size() by the amount of RAM available.

So although the software max_size is only limited by the operating system or library implementation, the number of elements that the runtime container can hold may be smaller than max_size.

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