Re: Problem with partial specialized member functions
Olaf wrote:
int19h@gmail.com schrieb:
On Jul 22, 11:13 pm, Olaf <o...@mdcc.de> wrote:
class EasyCurl : boost::noncopyable {
public:
template<typename T, long ID>
void setopt(const CurlOption<T, ID>& opt); //L351
};
and partially specialize the member function
template<long ID>
inline
void EasyCurl::setopt(const CurlOption<bool, ID>& opt) { //L389
curl_easy_setopt(m_curl, opt.option(), opt.value() ? 1 : 0);
}
The try to compile results in the error:
The problem is that C++ simply does not allow partial specialization
of functions, but only of classes. The common workaround is to move
the code from the function into a helper template class (so that the
function just delegates any calls to that class), and then specialize
the class.
Do you have an examples of this?
Thanks
Olaf
Usually I like to look at my references since my long term memory is
swiss cheese.. but
//Helper Template class
template <typename T>
struct Type2Type
{
typedef T OrigType;
};
//Generic Implementation
template <class U, class T>
T* Foo(const U& arg, Type2Type<T>)
{
return new T(arg);
}
//Partial Specialization
template <class U>
Bar* Foo(const U& arg, Type2Type<Bar>)
{
return new Bar(arg);
}
// Usage
String* pStr = Foo("Hello", Type2Type<String>());
Bar* pBar = Foo(1, Type2Type<Bar>());
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