将int64_t转换为double [英] Convert int64_t to double

问题描述

  int64_t a = 1234;

  double d = (double) a;

这是推荐的方法吗？

推荐答案

使用 static_cast 我建议使用隐式转换（或甚至C ++源代码中的C风格的转换）来反对 ，原因如下：

use static_cast as strager answers. I recommend against using the implicit cast (or even a C-style cast in C++ source code) for a few reasons:

• 隐式强制转换是编译器警告的常见来源，这意味着您可能会向构建中添加噪点（现在或以后添加更好的警告标记时）。


• 在你后面的维护程序员将看到一个隐式转换，并需要知道它是故意的行为还是一个错误/错误。让 static_cast 立即显示您的意图。


• static_cast 和其他C ++风格的转型可以很容易地处理 grep 。

• Implicit casts are a common source of compiler warnings, meaning you may be adding noise to the build (either now, or later when better warning flags are added).
• The next maintenance programmer behind you will see an implicit cast, and needs to know if it was intentional behavior or a mistake/bug. Having that static_cast makes your intent immediately obvious.
• static_cast and the other C++-style casts are easy for grep to handle.

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