OperatorBool.h

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//-*****************************************************************************
//
// Copyright (c) 2009-2011,
//  Sony Pictures Imageworks Inc. and
//  Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.
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#ifndef Alembic_Util_OperatorBool_h
#define Alembic_Util_OperatorBool_h

#include <Alembic/Util/Foundation.h>

//-*****************************************************************************
#define ALEMBIC_OPERATOR_BOOL( PASS_COND )                              \
void __unspecified_bool_type_fcn() const {}                             \
typedef void (this_type::*unspecified_bool_type)() const;               \
operator unspecified_bool_type() const                                  \
{                                                                       \
    return ( PASS_COND ) ? &this_type::__unspecified_bool_type_fcn : 0; \
}                                                                       \
bool operator! () const                                                 \
{                                                                       \
    return !( PASS_COND );                                              \
}


//-*****************************************************************************
#define ALEMBIC_OVERRIDE_OPERATOR_BOOL( PASS_COND )                     \
operator unspecified_bool_type() const                                  \
{                                                                       \
    return ( PASS_COND ) ?                                              \
        &operator_bool_base_type::__unspecified_bool_type_fcn : 0;      \
}                                                                       \
bool operator! () const                                                 \
{                                                                       \
    return !( PASS_COND );                                              \
}


#endif