Select one trait out of several that the parameterized type T may possess. If T has the parameterized trait TRAIT1, then the nested Type is TRAIT1, else if T has an optionally parameterized TRAIT2, then Type is TRAIT2, etc. Also computes an integral selection constant and meta-value. If T has none of the parameterized TRAIT*, then the nested Type is TypeTraitNil.
Declared in <bslalg_selecttrait.h>
template<
class TYPE,
class TRAIT1,
class TRAIT2 = TypeTraitNil,
class TRAIT3 = TypeTraitNil,
class TRAIT4 = TypeTraitNil,
class TRAIT5 = TypeTraitNil>
struct SelectTrait;| Name | Description |
|---|---|
Type | The actual trait that was selected, or TypeTraitNil if no trait was selected. |
| Name | Description |
|---|---|
Unnamed enum | Compile-time selection index for the chosen trait. |