sc_bit.h

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  source code Copyright (c) 1996-2014 by all Contributors.
  All Rights reserved.

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  set forth in the SystemC Open Source License (the "License");
  You may not use this file except in compliance with such restrictions and
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  License at http://www.accellera.org/. Software distributed by Contributors
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/*****************************************************************************

  sc_bit.h -- Bit class.

  Original Author: Stan Y. Liao, Synopsys, Inc.

 *****************************************************************************/

/*****************************************************************************

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

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// $Log: sc_bit.h,v $
// Revision 1.2  2011/08/07 18:54:19  acg
//  Philipp A. Hartmann: remove friend function declarations that implement
//  code, and clean up how bit and logic operators are defined in general.
//
// Revision 1.1.1.1  2006/12/15 20:20:04  acg
// SystemC 2.3
//
// Revision 1.6  2006/05/08 17:49:59  acg
//   Andy Goodrich: Added David Long's declarations for friend operators,
//   functions, and methods, to keep the Microsoft compiler happy.
//
// Revision 1.5  2006/04/12 20:17:52  acg
//  Andy Goodrich: enabled deprecation message for sc_bit.
//
// Revision 1.4  2006/01/24 20:50:55  acg
// Andy Goodrich: added warnings indicating that sc_bit is deprecated and that
// the C bool data type should be used in its place.
//
// Revision 1.3  2006/01/13 18:53:53  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//

#ifndef SC_BIT_H
#define SC_BIT_H


#include "sysc/datatypes/int/sc_nbdefs.h"
#include "sysc/utils/sc_iostream.h"


namespace sc_dt
{

// classes defined in this module
class sc_bit;

// forward class declarations
class sc_logic;

extern void sc_deprecated_sc_bit();

// ----------------------------------------------------------------------------
//  CLASS : sc_bit
//
//  Bit class.
//  Note: VSIA compatibility indicated.
// ----------------------------------------------------------------------------

class sc_bit
{
    // support methods

    static void invalid_value( char );
    static void invalid_value( int );

    static bool to_value( char c )
        {
            if( c != '0' && c != '1' ) {
                invalid_value( c );
            }
            return ( c == '0' ? false : true );
        }

    static bool to_value( int i )
        {
            if( i != 0 && i != 1 ) {
                invalid_value( i );
            }
            return ( i == 0 ? false : true );
        }
    static bool to_value( bool b )
       { return b; }

#define DEFN_TO_VALUE_T(tp)              \
    static bool to_value( tp i )         \
       { return to_value( (int) i); }

    DEFN_TO_VALUE_T(unsigned)
    DEFN_TO_VALUE_T(long)
    DEFN_TO_VALUE_T(unsigned long)
    DEFN_TO_VALUE_T(int64)
    DEFN_TO_VALUE_T(uint64)

#undef DEFN_TO_VALUE_T

public:

    // constructors
    // MANDATORY

    sc_bit()
        : m_val( false )
        {
            sc_deprecated_sc_bit();
        }

#define DEFN_CTOR_T(tp)              \
    explicit sc_bit( tp a )          \
       : m_val( to_value(a) )       \
       { sc_deprecated_sc_bit(); }

    DEFN_CTOR_T(bool)
    DEFN_CTOR_T(char)
    DEFN_CTOR_T(int)
    DEFN_CTOR_T(unsigned)
    DEFN_CTOR_T(long)
    DEFN_CTOR_T(unsigned long)
    DEFN_CTOR_T(int64)
    DEFN_CTOR_T(uint64)

#undef DEFN_CTOR_T

    explicit sc_bit( const sc_logic& a );  // non-VSIA


    // copy constructor
    // MANDATORY

    sc_bit( const sc_bit& a )
        : m_val( a.m_val )
        {}


    // destructor
    // MANDATORY

    ~sc_bit()
        {}


    // assignment operators
    // MANDATORY

    sc_bit& operator = ( const sc_bit& b )
        { m_val = b.m_val; return *this; }

#define DEFN_ASN_OP_T(op,tp) \
    sc_bit& operator op( tp b ) \
       { return ( *this op sc_bit( b ) ); }
#define DEFN_ASN_OP(op) \
    DEFN_ASN_OP_T(op,int) \
    DEFN_ASN_OP_T(op,bool) \
    DEFN_ASN_OP_T(op,char)

    DEFN_ASN_OP(=)
    DEFN_ASN_OP_T(=,int64)
    DEFN_ASN_OP_T(=,uint64)
    DEFN_ASN_OP_T(=,long)
    DEFN_ASN_OP_T(=,unsigned long)

    sc_bit& operator = ( const sc_logic& b );  // non-VSIA


    // bitwise assignment operators

    sc_bit& operator &= ( const sc_bit& b )
        { m_val = ( m_val && b.m_val ); return *this; }

    sc_bit& operator |= ( const sc_bit& b )
        { m_val = ( m_val || b.m_val ); return *this; }

    sc_bit& operator ^= ( const sc_bit& b )
        { m_val = ( m_val != b.m_val ); return *this; }

    DEFN_ASN_OP(&=)
    DEFN_ASN_OP(|=)
    DEFN_ASN_OP(^=)

#undef DEFN_ASN_OP_T
#undef DEFN_ASN_OP

    // conversions
    // MANDATORY

    // implicit conversion to bool

    operator bool () const
        { return m_val; }

    bool operator ! () const  // non-VSIA
        { return ! m_val; }


    // explicit conversions

    bool to_bool() const  // non-VSIA
        { return m_val; }

    char to_char() const
        { return ( m_val ? '1' : '0' ); }


    // relational operators and functions

    // MANDATORY

    friend bool operator == ( const sc_bit& a, const sc_bit& b );
    friend bool operator != ( const sc_bit& a, const sc_bit& b );

    // bitwise operators and functions

    // bitwise complement

    // MANDATORY

    friend const sc_bit operator ~ ( const sc_bit& a );

    // RECOMMENDED

    sc_bit& b_not()
        { m_val = ( ! m_val ); return *this; }

    // binary bit-wise operations

    friend const sc_bit operator | ( const sc_bit& a, const sc_bit& b );
    friend const sc_bit operator & ( const sc_bit& a, const sc_bit& b );
    friend const sc_bit operator ^ ( const sc_bit& a, const sc_bit& b );

    // other methods

    void print( ::std::ostream& os = ::std::cout ) const
       { os << to_bool(); }

    void scan( ::std::istream& = ::std::cin );

private:
    bool m_val;
};

// ----------------------------------------------------------------------------
// relational operators and functions

#define DEFN_BIN_FUN_T(ret,fun,tp)          \
    inline ret fun( const sc_bit& a, tp b ) \
       { return fun(a, sc_bit(b) ); }      \
    inline ret fun( tp b, const sc_bit& a ) \
       { return fun( sc_bit(a), b ); }

#define DEFN_BIN_FUN(ret,fun) \
      DEFN_BIN_FUN_T(ret,fun,bool) \
      DEFN_BIN_FUN_T(ret,fun,char) \
      DEFN_BIN_FUN_T(ret,fun,int)

// MANDATORY

inline bool operator == ( const sc_bit& a, const sc_bit& b )
    { return ( a.m_val == b.m_val ); }

inline bool operator != ( const sc_bit& a, const sc_bit& b )
    { return ( a.m_val != b.m_val ); }

DEFN_BIN_FUN(bool,operator==)
DEFN_BIN_FUN(bool,operator!=)

// OPTIONAL

inline bool equal( const sc_bit& a, const sc_bit& b )
    { return ( a == b ); }

inline bool not_equal( const sc_bit& a, const sc_bit& b )
    { return ( a != b ); }

DEFN_BIN_FUN(bool,equal)
DEFN_BIN_FUN(bool,not_equal)

// ----------------------------------------------------------------------------
// bitwise operators and functions

// bitwise complement

    // MANDATORY

    inline const sc_bit operator ~ ( const sc_bit& a )
       { return sc_bit( ! a.m_val ); }


    // OPTIONAL

    inline const sc_bit b_not( const sc_bit& a )
       { return ( ~ a ); }


    // RECOMMENDED

    inline void b_not( sc_bit& r, const sc_bit& a )
       { r = ( ~ a ); }

    // binary bit-wise operations

    // MANDATORY

    inline const sc_bit operator & ( const sc_bit& a, const sc_bit& b )
        { return sc_bit( a.m_val && b.m_val ); }

    inline const sc_bit operator | ( const sc_bit& a, const sc_bit& b )
        { return sc_bit( a.m_val || b.m_val ); }

    inline const sc_bit operator ^ ( const sc_bit& a, const sc_bit& b )
        { return sc_bit( a.m_val != b.m_val ); }

    DEFN_BIN_FUN(const sc_bit,operator&)
    DEFN_BIN_FUN(const sc_bit,operator|)
    DEFN_BIN_FUN(const sc_bit,operator^)

    // OPTIONAL

    inline const sc_bit b_and ( const sc_bit& a, const sc_bit& b )
        { return a & b; }

    inline const sc_bit b_or ( const sc_bit& a, const sc_bit& b )
        { return a | b; }

    inline const sc_bit b_xor ( const sc_bit& a, const sc_bit& b )
        { return a ^ b; }

    DEFN_BIN_FUN(const sc_bit,b_and)
    DEFN_BIN_FUN(const sc_bit,b_or)
    DEFN_BIN_FUN(const sc_bit,b_xor)

    // RECOMMENDED

#define DEFN_TRN_FUN_T(fun,tp)                                     \
    inline void fun( sc_bit& r, const sc_bit& a, tp b )            \
        { r = fun( a, sc_bit(b) ); }                               \
    inline void fun( sc_bit& r, tp a, const sc_bit& b )            \
        { r = fun( sc_bit(a), b ); }

#define DEFN_TRN_FUN(fun) \
    inline void fun( sc_bit& r, const sc_bit& a, const sc_bit& b ) \
        { r = fun( a , b ); }                                      \
    DEFN_TRN_FUN_T(fun,int)                                        \
    DEFN_TRN_FUN_T(fun,bool)                                       \
    DEFN_TRN_FUN_T(fun,char)

    DEFN_TRN_FUN( b_and )
    DEFN_TRN_FUN( b_or )
    DEFN_TRN_FUN( b_xor )

#undef DEFN_BIN_FUN_T
#undef DEFN_BIN_FUN
#undef DEFN_TRN_FUN_T
#undef DEFN_TRN_FUN


// ----------------------------------------------------------------------------

inline
::std::ostream&
operator << ( ::std::ostream& os, const sc_bit& a )
{
    a.print( os );
    return os;
}

inline
::std::istream&
operator >> ( ::std::istream& is, sc_bit& a )
{
    a.scan( is );
    return is;
}

} // namespace sc_dt


#endif

// Taf!