C++内联类定义和对象初始化
我刚刚遇到以下代码：
#include <iostream>
static class Foo
{
public:
Foo()
{
std::cout << "HELLO" << std::endl;
}
void foo()
{
std::cout << "in foo" << std::endl;
}
}
blah;
int main()
{
std::cout << "exiting" << std::endl;
blah.foo();
return 0;
}
我之前没有见过上面定义变量的方法 - 类定义是与变量定义内联完成的。这让我想起了Java中的匿名类。这叫什么？它在 C++ 标准中吗？
谢谢塔拉斯
I've just come across the following code:
#include <iostream>
static class Foo
{
public:
Foo()
{
std::cout << "HELLO" << std::endl;
}
void foo()
{
std::cout << "in foo" << std::endl;
}
}
blah;
int main()
{
std::cout << "exiting" << std::endl;
blah.foo();
return 0;
}
I haven't seen the above method of definining a variable before - the class definition is done inline with the variable definition. It reminds me of anonymous classes in Java. What is this called, and is it in the C++ standard?
Thanks
Taras
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定义
class（或struct）是相当标准的，除了默认是public而不是private之外，完全等效）并声明其类型的变量（或指向此类变量的指针等）——这在 C 中是可以的（使用struct，但正如我已经提到的 C++ 的class，除了公共与私有之外，与struct相同）并且C++主要保持与（ISO-1989）C的向上兼容性。从未听说过它有任何特殊名称。It's quite standard to define a
class(orstruct, perfectly equivalent except that the default ispublicinstead ofprivate) and declare a variable of its type (or pointer to such a variable, etc) -- it was OK in C (withstruct, but as I already mentioned C++'sclass, save for public vs private, is the same thing asstruct) and C++ mostly maintains upwards compatibility with (ISO-1989) C. Never heard it called by any special name.