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#pragma once
#include <map>
#include <stdexcept>
#include <string>
#include <vector>
struct concept;
template <typename T> struct value;
struct ref
{
ref(concept *p) : ptr(p) { }
concept* operator->() { return ptr; }
// for use by containers
bool operator<(ref const & other) const { return ptr < other.ptr; }
// for helpers
ref(std::string const &);
ref(char const * str) : ref(std::string(str)) { }
ref() : ref("nothing") { }
value<std::string> & name() const;
operator const char *() const;
concept * ptr;
};
struct concept
{
// a concept is made of concept-typed links to other concepts
std::multimap<ref,ref> links;
using array = std::vector<ref>;
ref id();
ref get(ref type); // returns first
array getAll(ref type);
void link(ref type, ref target);
void unlink(ref type, ref target);
};
template <typename T>
struct value : public concept, public T
{
value(T const & val) : T(val) {}
value(value<T> const & val) = default;
static value<T>& of(ref c)
{
return *static_cast<value<T>*>(c.ptr);
}
};
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