This component-private metafunction checks whether a conversion from a pointer type to (template parameter) t_TYPE is narrowing. It is instantiated only for bool, and its behavior depends on whether the compiler has implemented P1957R2.
Declared in <bslstl_variant.h>
template<
class t_TYPE,
class = void>
struct Variant_CheckForP1957R2
: bsl::true_type| Name | Description |
|---|---|
bsl::true_type | Metafunction representing the boolean constant true. |
| Name |
|---|
Variant_CheckForP1957R2<t_TYPE, bsl::void_t<decltype(Variant_ArrayHelper<t_TYPE>{{"bc"}})>> |