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[英]Using the PIMPL idiom, should the implementation always be a private member of the class?
[英]Pimpl idiom used with a class member variable
什么是實現這個類的正確方法?
//Header
#include <boost/shared_ptr.hh>
class MyClass
{
public:
static foo()
static foobar();
private:
class pimpl;
static boost::shared_ptr<pimpl> m_handle;
static bool initialized;
};
//source
namespace
{
bool init()
{
//...
// init() can't access m_handle, unless it is a friend of MyClass
// but that seems a bit "tacky", is there a better way?
}
}
class MyClass::pimpl
{
public:
~pimpl(){}
}
bool MyClass::initialized = init();
MyClass::foo()
{
//...
}
MyClass::foobar()
{
//...
}
MyClass
是一個單身人士 - 有人稱之為美化全球。 經常被濫用的模式。 使用私有ctors和公共靜態訪問器:
MyClass {
public:
static MyClass& Instance() {
static MyClass obj;
return obj;
}
// ...
private:
MyClass() : m_handle(pimpl()), initialized(true) {}
// ...
};
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