Correct way to define C++ namespace methods in .cpp file(在 .cpp 文件中定义 C++ 命名空间方法的正确方法)
问题描述
Probably a duplicate, but not an easy one to search for...
Given a header like:
namespace ns1
{
class MyClass
{
void method();
};
}
I've see method()
defined in several ways in the .cpp file:
Version 1:
namespace ns1
{
void MyClass::method()
{
...
}
}
Version 2:
using namespace ns1;
void MyClass::method()
{
...
}
Version 3:
void ns1::MyClass::method()
{
...
}
Is there a 'right' way to do it? Are any of these 'wrong' in that they don't all mean the same thing?
Version 2 is unclear and not easy to understand because you don't know which namespace MyClass
belongs to and it's just illogical (class function not in the same namespace?)
Version 1 is right because it shows that in the namespace, you are defining the function.
Version 3 is right also because you used the ::
scope resolution operator to refer to the MyClass::method ()
in the namespace ns1
. I prefer version 3.
See Namespaces (C++). This is the best way to do this.
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