out-of-class member template definition

在Modern C++ Design的第五章裡看到了


template
template
Functor::Functor(const Fun& fun)
: spImpl_(new FunctorHandler(fun));
{


}

這就是 out-of-class member template definition
前面的template  是給class的template
後面的template 是給function(cstor)的template

這也有類似的例子
http://stackoverflow.com/questions/5895179/syntax-of-out-of-class-definition-of-a-template-member-function-of-a-template-cl