在哪里画为size_t和unsigned int之间的界限？ [英] Where to draw the line between size_t and unsigned int?

问题描述

我目前在我一个$ C转换 unsigned int类型到为size_t 的某些用途的过程我一直在开发，多年来$ C基地。我理解这两个和例如 unsigned int类型可能是32位，而指针和为size_t 可能是之间的差异64位。我的问题更多的是，我应该使用一个，使用什么样的约定人民对两者之间的选择。

I'm currently in the process of converting some uses of unsigned int to size_t in my a code base that I have been developing over the years. I understand the difference between the two and that for example unsigned int could be 32-bit while pointers and size_t could be 64-bit. My question is more about where I should use either one and what kind of convention people use for picking between the two.

这是相当清楚的是内存的分配应该采取为size_t 而不是 unsigned int类型作为参数，或者容器类应STL使用为size_t 的大小和索引等。这些都是阅读为size_t 的好处VS unsigned int类型时，常见的情况称。然而，在code碱基转换工作时，我偶然发现了相当多的情况下，在我不知道使用哪一个灰色地带。例如，如果4x4矩阵的行/列索引应为size_t 的一致性，无论该指数范围为[0,3]，或者如果屏幕/贴图分辨率应该使用为size_t 尽管在几千元范围内，或一般，如果对象的合理数量预计将在几十的范围内，我应该还在用为size_t 的一致性。

It's quite clear that memory allocation should take size_t instead of unsigned int as an argument, or that container classes should use size_t for size and indexing like in STL. These are the common cases referred when reading about the benefits of size_t vs unsigned int. However, while working on the code base conversion I stumbled upon quite a few cases in gray areas where I'm not sure which one to use. For example if 4x4 matrix row/column index should be size_t for consistency regardless the index being in range [0, 3], or if screen/texture resolution should use size_t despite of being in range of few thousand, or in general if the reasonable number of objects is expected to be in the range of tens I should still use size_t for consistency.

什么样的​​，你使用无符号整型之间采摘编码约定和为size_t ？如若一切的重新presenting大小（以字节为单位或对象），或索引总是为size_t 不管是合理预期的范围？有一些被广泛接受的为size_t 约定使用成熟的库，我可以遵循？

What kind of coding conventions you use for picking between unsigned int and size_t? Should everything that's representing size (in bytes or objects), or index be always size_t regardless of the reasonably expected range? Is there some widely accepted size_t convention used in well-established libraries that I could follow?

推荐答案

我觉得这很简单，但我欢迎枪暗箭。

I think it's simple, although I welcome the slings and arrows.

为size_t 如果它描述的东西，有一个尺寸应该被使用。 （计数。A 的东西数量的）

size_t should be used if it describes something that has a size. (A count. A number of things)

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