//===-- UserID.h ------------------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//


#ifndef liblldb_UserID_h_
#define liblldb_UserID_h_

#include "lldb/lldb-private.h"

namespace lldb_private {

//----------------------------------------------------------------------
/// @class UserID UserID.h "lldb/Core/UserID.h"
/// @brief A mix in class that contains a generic user ID.
///
/// UserID is desinged as a mix in class that can contain an integer
/// based unique identifier for a varietly of objects in lldb.
///
/// The value for this identifier is chosen by each parser plug-in. A
/// value should be chosen that makes sense for each kind of object
/// should and allows quick access to further and more in depth parsing.
///
/// Symbol table entries can use this to store the original symbol table
/// index, functions can use it to store the symbol table index or the
/// DWARF offset.
//----------------------------------------------------------------------
struct UserID
{
    //------------------------------------------------------------------
    /// Construct with optional user ID.
    //------------------------------------------------------------------
    UserID (lldb::user_id_t uid = LLDB_INVALID_UID) : m_uid(uid) {}

    //------------------------------------------------------------------
    /// Destructor.
    ///
    /// The destructor is virtual in case this class is subclassed.
    //------------------------------------------------------------------
    virtual
    ~UserID ();

    //------------------------------------------------------------------
    /// Clears the object state.
    ///
    /// Clears the object contents back to a default invalid state.
    //------------------------------------------------------------------
    void
    Clear () { m_uid = LLDB_INVALID_UID; }

    //------------------------------------------------------------------
    /// Get accessor for the user ID.
    ///
    /// @return
    ///     The user ID.
    //------------------------------------------------------------------
    lldb::user_id_t
    GetID () const { return m_uid; }

    //------------------------------------------------------------------
    /// Set accessor for the user ID.
    ///
    /// @param[in] uid
    ///     The new user ID.
    //------------------------------------------------------------------
    void
    SetID (lldb::user_id_t uid) { m_uid = uid; }

    //------------------------------------------------------------------
    /// Unary predicate function object that can search for a matching
    /// user ID.
    ///
    /// Function object that can be used on any class that inherits
    /// from UserID:
    /// \code
    /// iterator pos;
    /// pos = std::find_if (coll.begin(), coll.end(), UserID::IDMatches(blockID));
    /// \endcode
    //------------------------------------------------------------------
    class IDMatches
    {
    public:
        //--------------------------------------------------------------
        /// Construct with the user ID to look for.
        //--------------------------------------------------------------
        IDMatches (lldb::user_id_t uid) : m_uid(uid) {}

        //--------------------------------------------------------------
        /// Unary predicate function object callback.
        //--------------------------------------------------------------
        bool
        operator () (const UserID& rhs) const { return m_uid == rhs.GetID(); }

    private:
        //--------------------------------------------------------------
        // Member variables.
        //--------------------------------------------------------------
        const lldb::user_id_t m_uid; ///< The user ID we are looking for
    };


protected:
    //------------------------------------------------------------------
    // Member variables.
    //------------------------------------------------------------------
    lldb::user_id_t m_uid; ///< The user ID that uniquely identifies an object.
};

//--------------------------------------------------------------
/// Stream the UserID object to a Stream.
//--------------------------------------------------------------
inline bool operator== (const UserID& lhs, const UserID& rhs)
{
  return lhs.GetID() == rhs.GetID();
}

inline bool operator!= (const UserID& lhs, const UserID& rhs)
{
  return lhs.GetID() != rhs.GetID();
}

Stream& operator << (Stream& strm, const UserID& uid);

} // namespace lldb_private

#endif  // liblldb_UserID_h_