Qt类型的限制在哪里？ [英] Where are the limits for Qt types?

问题描述

定期地，我可以引用limits.h以查看某个类型的最大值，例如int或long。

Regularly, I could reference limits.h to see what the max is for a certain type, like an int or long.

在Qt中， qlonglong。有没有头文件和/或文档可以用类似的方式手动或以编程方式引用这些类型的限制？

In Qt, there are types like qlonglong. Is there a header file and/or documentation that can be used in a similar way to manually or programmatically reference the limits of these types?

推荐答案

很有可能Qt类型可以归结为定义 numeric_limits 的基本类型之一。您是否尝试过调用 std :: numeric_limits :: max（）？

There's a high likelihood the Qt types distill down to one of the basic types for which numeric_limits are defined. Have you tried calling e.g., std::numeric_limits<qlonglong>::max()?

out，如果类型不是内置 numeric_limits ，仍然可以专门为他们。如果是这种情况，人们希望Qt会包括他们。

As MSalters points out, too, if the types are not builtin numeric_limits can still be specialized for them. If that were the case one would hope Qt would include them.

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