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Front Page / Metafunctions / Bitwise Operations / bitor_



      typename T1
    , typename T2
    , typename T3 = unspecified
    , typename Tn = unspecified
struct bitor_
    typedef unspecified type;


Returns the result of bitwise or (|) operation of its arguments.


#include <boost/mpl/bitor.hpp>
#include <boost/mpl/bitwise.hpp>

Model of

Numeric Metafunction


Parameter Requirement Description
T1, T2,... Tn Integral Constant Operation's arguments.

[Note: The requirements listed in this specification are the ones imposed by the default implementation. See Numeric Metafunction concept for the details on how to provide an implementation for a user-defined numeric type that does not satisfy the Integral Constant requirements. — end note]

Expression semantics

For any Integral Constants c1,c2,... cn:

typedef bitor_<c1,>::type r; 
Return type:Integral Constant.

Equivalent to

typedef integral_c<
      typeof(c1::value | c2::value)
    , ( c1::value | c2::value )
    > c;
typedef bitor_<c,c3,>::type r; 
typedef bitor_<c1,> r;
Return type:Integral Constant.

Equivalent to

struct r : bitor_<c1,>::type {};


Amortized constant time.


typedef integral_c<unsigned,0> u0;
typedef integral_c<unsigned,1> u1;
typedef integral_c<unsigned,2> u2;
typedef integral_c<unsigned,8> u8;
typedef integral_c<unsigned,0xffffffff> uffffffff;

BOOST_MPL_ASSERT_RELATION( (bitor_<u0,u0>::value), ==, 0 );
BOOST_MPL_ASSERT_RELATION( (bitor_<u1,u0>::value), ==, 1 );
BOOST_MPL_ASSERT_RELATION( (bitor_<u0,u1>::value), ==, 1 );
BOOST_MPL_ASSERT_RELATION( (bitor_<u0,uffffffff>::value), ==, 0xffffffff );
BOOST_MPL_ASSERT_RELATION( (bitor_<u1,uffffffff>::value), ==, 0xffffffff );
BOOST_MPL_ASSERT_RELATION( (bitor_<u8,uffffffff>::value), ==, 0xffffffff );

See also

Bitwise Operations, Numeric Metafunction, numeric_cast, bitand_, bitxor_, shift_left