reinterpret_cast和C风格的cast有什么区别？ [英] What is the difference between a reinterpret_cast and a C-style cast?

问题描述

以下两者之间的区别：

double x = 10.3;
int y;
y = (int) x;    // c-like cast notation

和：

double x = 10.3;
int y;
y = reinterpret_cast<int>(x)   

推荐答案

C风格的Cast可以是以下任何类型的Cast：

A C-style cast can be any of the following types of casts:

• const_cast


• static_cast


• static_cast 后跟一个 const_cast


• reinterpret_cast


• reinterpret_cast 后接 const_cast

• const_cast
• static_cast
• static_cast followed by a const_cast
• reinterpret_cast
• reinterpret_cast followed by a const_cast

从列表中可以做的第一个是C风格的转换将执行什么（从C ++ 03 5.4：显式类型转换（cast符号）

the first one from that list that can be done is the what the C-style cast will perform (from C++03 5.4: "Explicit type conversion (cast notation)"

所以你的例子：

double x = 10.3;
int y;
y = (int) x;

code> static_cast 。

the type of cast used would be a static_cast.

和 y = reinterpret_cast< int>（x）; 将无法编译。

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