static_cast< char *>和（char *） [英] Difference between static_cast<char*> and (char*)
问题描述
这是我的第一个问题：）
this is my first question :)
我有一个桩文件，我打开它，如下所示;
I have one pile file, and I have open it like shown below ;
ifstream in ( filename, ios :: binary | ios :: in )
$ b $然后，我希望在unsigned int hold中保存2字节数据;
Then, I wish hold 2 byte data in unsigned int hold ;
unsigned int hold;
in . read(static_cast<char *>(&hold), 2);
对我来说似乎是正确的。但是，当我用
It seems correct to me. However, when I compile it with
g++ -ansi -pedantic-errors -Werror - -Wall -o main main.cpp
编译器发出错误
error: invalid static_cast from type ‘unsigned int*’ to type ‘char*’
实际上，我已经解决了这个问题通过改变static_cast与（char *），即
Actually, I have solved this problem by changing static_cast with ( char*), that is
unsigned int hold;
in . read((char*)(&hold), 2);
我的问题是：
-
static_cast< char *>和（char *）之间有什么区别？？ 我不确定是否使用
（char *）如果你有足够的知识，你能告诉我这个话题吗？ - What is the difference(s) between
static_cast<char*>and(char*)? - I am not sure whether using
(char*)is a safer or not. If you have enough knowledge, can you inform me about that topic ?
注意：如果你有更好的主意，请帮助我，我可以改善我的问题吗？
NOTE : If you have better idea, please help me so that I can improve my question?
推荐答案
static_cast 隐式C风格的转换。如果你试图投射一个与另一个不兼容的实体，则 static_cast 会给你一个编译时间错误，与隐式c风格的转换不同。
static_cast is a safer cast than the implicit C style cast. If you try to cast an entity which is not compatible to another, then static_cast gives you an compilation time error unlike the implicit c-style cast.
static_cast 在这里给你一个错误，因为你想说的是一个 int 并尝试将其放在 char 中，这是不可能的。 int 需要比 char 占用更多的内存，并且无法以安全的方式进行转换。
static_cast gives you an error here because what you are trying to say is take an int and try to fit it in a char, which is not possible. int needs more memory than what char occupies and the conversion cannot be done in a safe manner.
如果你仍然想要实现这一点，你可以使用 reinterpret_cast ，它允许你类型化两种完全不同的数据类型，但它是不安全。
使用 reinterpret_cast 得到的唯一保证是，如果将结果转换回原始类型，您将获得相同的值，但没有其他安全保证。
If you still want to acheive this,You can use reinterpret_cast, It allows you to typecast two completely different data types, but it is not safe.
The only guarantee you get with reinterpret_cast is that if you cast the result back to the original type, you will get the same value, But no other safety guarantees.
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