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#pragma once
#include <map>
#include <stdexcept>
#include <string>
#include <vector>
template <typename T> struct vref;
struct concept;
template <typename T> struct value;
struct ref
{
ref(concept *p) : ptr(p) { if (p == 0) throw std::logic_error("null reference"); }
ref(ref const &) = default;
concept* operator->() { return ptr; }
bool operator==(ref const & that) const { return this->ptr == that.ptr; }
bool operator<(ref const &) const { throw std::logic_error("ref has redefined syntax sugar: do not use in containers"); }
// for helpers
ref(std::string const &);
ref(char const * str) : ref(std::string(str)) { }
ref(bool b) : ref(b ? "true" : "false") { }
ref() : ref("nothing") { }
value<std::string> & name() const;
operator const char *() const;
ref operator=(ref other); // helper constructs new concept with this as link
ref operator[](ref links); // helper sets all links from passed concept
bool isa(ref what) const;
bool isan(ref what) const;
concept * ptr;
};
template <typename T>
struct vref
{
vref(value<T> *p) : ptr(p) { }
value<T>* operator->() { return ptr; }
operator T const &() const { return *ptr; }
vref(ref const & other) : ptr(static_cast<value<T>*>(other.ptr)) { }
operator ref() { return ptr; }
// for use by containers
//bool operator<(ref const & other) const { return ptr < other.ptr; }
value<T> * ptr;
};
struct concept
{
// a concept is made of concept-typed links to other concepts
std::multimap<concept*,concept*> links;
using array = std::vector<ref>;
ref id();
bool linked(ref type);
bool linked(ref type, ref target);
ref get(ref type); // returns first
template <typename T>
vref<T> vget(ref type) { return get(type); }
array getAll(ref type);
void link(ref type, ref target);
void unlink(ref type, ref target);
void unlink(ref type);
};
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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