The BOOST_PP_DEC macro expands to one less than its argument.

#### Usage

BOOST_PP_DEC(x)

#### Arguments

x
  The value to be decremented. Valid values range from 0 to BOOST_PP_LIMIT_MAG.

#### Remarks

If x is 0, the result is saturated to 0.

#### See Also

- BOOST_PP_INC
- BOOST_PP_LIMIT_MAG

#### Requirements

Header: <boost/preprocessor/arithmetic/dec.hpp>

#### Sample Code

    #include <boost/preprocessor/arithmetic/dec.hpp>

    BOOST_PP_DEC(BOOST_PP_DEC(6)) // expands to 4
    BOOST_PP_DEC(0) // expands to 0