本文介绍了可以在gcc中模拟nullptr吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我看到 nullptr
在Visual Studio 2010中实现。我喜欢这个概念,并希望尽快开始使用它;然而GCC不支持它。我的代码需要在两者上运行(但不必与其他编译器一起编译)。
I saw that nullptr
was implemented in Visual Studio 2010. I like the concept and want to start using it as soon as possible; however GCC does not support it yet. My code needs to run on both (but doesn't have to compile with other compilers).
有没有办法模拟它?像:
Is there a way to "emulate" it? Something like:
#define nullptr NULL
(这显然不会很好,只是为了显示我的意思。)
(That obviously wouldn't work well at all, it's just to show what I mean.)
推荐答案
有一个解决方法 -
The Official proposal has a workaround -
const // this is a const object...
class {
public:
template<class T> // convertible to any type
operator T*() const // of null non-member
{ return 0; } // pointer...
template<class C, class T> // or any type of null
operator T C::*() const // member pointer...
{ return 0; }
private:
void operator&() const; // whose address can't be taken
} nullptr = {}; // and whose name is nullptr
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