(void*)0 in C & C++. I would like to clarify that no it's not: NULL - cppreference.com (C) NULL - cppreference.com (C++) C++ requires that macro NULL to be defined as an integral constant expression having the
call it nullptr; that's what it's called in C ++11. Then, "nullptr" will be a keyword.NU...
[3]https://www.quora.com/Whats-the-difference-between-NULL-and-nullptr-in-C++
} root@ubuntu:~/c++# g++ -std=c++11null.cpp -onullnull.cpp: In function ‘intmain()’:null.cpp:14:17: error: call of overloaded ‘myprint(NULL)’isambiguous myprint(NULL);//compile error^null.cpp:4:6: note: candidate:voidmyprint(char*)voidmyprint(char*p) {^null.cpp:8:6: not...
#if defined (_STDDEF_H) || defined (__need_NULL) #undef NULL/* in case <stdio.h> has...
root@ubuntu:~/c++# g++ -std=c++11null.cpp -onullnull.cpp: In function ‘intmain()’:null.cpp:14:17: error: call of overloaded ‘myprint(NULL)’isambiguous myprint(NULL);//compile error^null.cpp:4:6: note: candidate:voidmyprint(char*)voidmyprint(char*p) {^null.cpp:8:6: note:...
C++使用STL时需要注意 你的代码遵循的c++版本有些特性只有高版本c++才支持 如thread、mutex至少需要c++11 g++编译时默认遵循c++98 可以使用-std=<standard>指定c++版本c++版本经历了c++98、c++03、c++11、c++14、c++17 cpp代码中__cplusplus预定义宏表明了当前编译遵循的c++版本经g++加-std ...
In case of function overloading with handles to different types, an ambiguity error will be generated. The nullptr would have to be explicitly cast to a type. 复制 // mcpp_nullptr_2.cpp // compile with: /clr /LD void f(int *){} void f(int ^){} void f_null() { f(nullptr)...
$ g+-onullnull.cppnull.cpp:Infunction'int main()':null.cpp:5:17:error:invalid conversionfrom'void*'to'int*'[-fpermissive]int*a=(void*)p; 所以不能将NULL定义为(void*)0。 nullptr nullptr并非整型类别,甚至也不是指针类型,但是能转换成任意指针类型。nullptr的实际类型是std:nullptr_t。
这实际上是VS code编辑器中C++标准设置的问题,你会发现你能够正常运行代码,只是这些鲜红的警告让你很头疼。如下图是报错的地方。 你需要做的是打开偏好设置中的设置选项: 然后在搜索框中键入cpp standard,将cpp...c# 中 string.Empty , "", null 的区别 原文地址:http://www.bitscn.com/pdb/dotnet/201003...