vl_fwd.h

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#pragma once
 
#include <memory>
#include <functional>
 
namespace vl
{
    enum class Type
    {
        Bool,
        Number,
        String,
        Object,
        List,
        Null,
        Count
    };
 
    class BoolVar;
    class NumberVar;
    class StringVar;
    class ObjectVar;
    class ListVar;
    class NullVar;
    class AbstractVar;
    class Visitor;
    class ObjectSetRet;
 
    class Observable;
    class Observer;
 
    // User-friendly type names. Available from the namespace vl
    // Like vl::Bool
    typedef BoolVar Bool;
    typedef NumberVar Number;
    typedef StringVar String;
    typedef ObjectVar Object;
    typedef ListVar List;
    typedef AbstractVar Var;
    typedef NullVar Null;
    typedef std::shared_ptr<Var> VarPtr;
 
    extern vl::Object nullObject;
    extern vl::ListVar emptyList;
    extern vl::NullVar emptyVar;
 
    typedef std::function<void(const vl::Object&)> VoidCbObject;
    typedef std::function<bool(const vl::Object&)> BoolCbObject;
}