c++ template class; function with arbitrary container type, how to define it?
Okay, simple template question. Say I define my template class something like this:
template
class foo {
public:
foo(T const& first
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Make the template templated on a template template parameter:
template class Container> void bar(const Container& c, const T & t) { // } If you don't have C++11, then you can't use variadic templates, and you have to provide as many template parameters as your container takes. For example, for a sequence container you might need two:
template class Container, typename Alloc> void bar(const ContainerOr, if you only want to allow allocators which are themselves template instances:
template class Container, templateclass Alloc> void bar(const Container
As I suggested in the comments, I would personally prefer to make the entire container a templated type and use traits to check if it's valid. Something like this:
templatetypename std::enable_if This is more flexible since the container can now be anything that exposes the
value_typemember type. More sophisticated traits for checking for member functions and iterators can be conceived of; for example, the pretty printer implements a few of those.
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