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downloads/boost_1_33_1/libs/mpl/doc/src/refmanual/IntegralConstant.rst
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Integral Constant
Description
An |Integral Constant| is a holder class for a compile-time value of an integral type. Every |Integral Constant| is also a nullary |Metafunction|, returning itself. An integral constant object is implicitly convertible to the corresponding run-time value of the wrapped integral type.
Expression requirements
|In the following table...| n is a model of |Integral Constant|.
| Expression | Type | Complexity |
|---|---|---|
| n::value_type | An integral type | Constant time. |
| n::value | An integral constant expression | Constant time. |
| n::type | |Integral Constant| | Constant time. |
| next<n>::type | |Integral Constant| | Constant time. |
| prior<n>::type | |Integral Constant| | Constant time. |
| n::value_type const c = n() | Constant time. |
Expression semantics
| Expression | Semantics |
|---|---|
| n::value_type | A cv-unqualified type of n::value. |
| n::value | The value of the wrapped integral constant. |
| n::type | is_same<n::type,n>::value == true. |
| next<n>::type | An |Integral Constant| c of type n::value_type such that c::value == n::value + 1. |
| prior<n>::type | An |Integral Constant| c of type n::value_type such that c::value == n::value - 1. |
| n::value_type const c = n() | c == n::value. |
Models
See also
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