Is nullptr in C++ the same as null in C#?
c++中的nullptr和c#中的null一样吗?
Seems like no one asked this question on Google or Stackflow.
似乎没有人在谷歌或Stackflow上问过这个问题。
3 个解决方案
#1
13
In general yes, both assign the null value to pointer like types
一般来说，都将空值赋给指针类型
- C#: class, interface, delegate or pointer types
- 类、接口、委托或指针类型
- C++: pointer types or pointer-to-member type
- c++:指针类型或指针到成员类型
It doesn't convert to numeric values in either language. One difference though is that in C++ nullptr can convert to bool. This is not true in C#
它不会在两种语言中转换为数值。一个区别是，在c++中，nullptr可以转换为bool。在c#中不是这样的
#2
4
Yes. In C++, nullptr is the equivalent of null in Java, C#, and a variety of other languages. Prior to C++11, it was standard to use NULL (which was a macro defined as 0); however, nullptr actually ensures that it can be used only in the context of pointers (whereas NULL, by virtue of having been defined as 0, can also be used as the return value for a function that returns an int instead of a pointer, which is counterintuitive), though both nullptr and NULL are implicitly convertible to bool.
是的。在c++中，nullptr在Java、c#和其他各种语言中等同于null。在c++ 11之前，标准使用NULL(宏定义为0);然而,实际上nullptr确保它只可以使用上下文中的指针(而空,由于被定义为0,也可以使用作为一个函数的返回值返回一个int,而不是指针,这是违反直觉的),虽然bool nullptr和零都是隐式转换。
#3
0
Yes, it is the same. It is the invalid pointer.
是的，是一样的。它是无效指针。
#1
13
In general yes, both assign the null value to pointer like types
一般来说，都将空值赋给指针类型
- C#: class, interface, delegate or pointer types
- 类、接口、委托或指针类型
- C++: pointer types or pointer-to-member type
- c++:指针类型或指针到成员类型
It doesn't convert to numeric values in either language. One difference though is that in C++ nullptr can convert to bool. This is not true in C#
它不会在两种语言中转换为数值。一个区别是，在c++中，nullptr可以转换为bool。在c#中不是这样的
#2
4
Yes. In C++, nullptr is the equivalent of null in Java, C#, and a variety of other languages. Prior to C++11, it was standard to use NULL (which was a macro defined as 0); however, nullptr actually ensures that it can be used only in the context of pointers (whereas NULL, by virtue of having been defined as 0, can also be used as the return value for a function that returns an int instead of a pointer, which is counterintuitive), though both nullptr and NULL are implicitly convertible to bool.
是的。在c++中，nullptr在Java、c#和其他各种语言中等同于null。在c++ 11之前，标准使用NULL(宏定义为0);然而,实际上nullptr确保它只可以使用上下文中的指针(而空,由于被定义为0,也可以使用作为一个函数的返回值返回一个int,而不是指针,这是违反直觉的),虽然bool nullptr和零都是隐式转换。
#3
0
Yes, it is the same. It is the invalid pointer.
是的，是一样的。它是无效指针。