Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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Integral Constant
An Integral Constant is a class representing a value of a built-in integral type (bool, int, long, etc.) in compile-time programs. An integral constant directly supports the increment/decrement operations within the range of the built-in integral type it wraps. Other arithmetic operations are supported through the external metafunctions.
| Expression | Return type |
|---|---|
typename n::value_type | An integral type |
typename n::type | A model of Integral Constant |
n::value | A compile-time integral constant of n::value_type |
typename n::next | A model of Integral Constant |
typename n::prior | A model of Integral Constant |
| Expression | Complexity | Precondition | Semantics | Postcondition |
|---|---|---|---|---|
typename n::value_type | Amortized constant time | n::value_type is identical to typeof(n::value) | ||
typename n::type | Amortized constant time | Self-reference. | is_same<n::type,n>::value == true | |
n::value | Amortized constant time | Value of n. | ||
typename n::next | Amortized constant time | n::value_type supports an increment operation; n::value is incrementable | Increment operation | n::next::value == n::value + 1 |
typename n::prior | Amortized constant time | n::value_type supports an decrement operation; n::value is decrementable | Decrement operation | n::prior::value == n::value - 1 |
integral_c
int_
bool_
next, prior