Tag type distinguishing user arguments from enable_if defaults.
Declared in <bslstl_optional.h>
struct Optional_OptNoSuchType;This component-private trivial tag type is used to distinguish between arguments passed by a user, and an enable_if argument. It is not default constructible so the following construction never invokes a constrained single parameter constructor: ` optional<SomeType> o(int, {}); `
| Name | Description |
|---|---|
Optional_OptNoSuchType [constructor] | Create an Optional_OptNoSuchType object. |