# `is_exception_ptr_available<T>`

`::value` is true if an exception ptr can be constructed from a `T` e.g. if there exists an ADL discovered free function `make_exception_ptr(T)`. `::type` is the type that would result if `::value` is true, else `void`.

Overridable: By template specialisation into the `trait` namespace.

Default: True if `T` is an exception ptr, else to metaprogramming which performs the ADL discovery of `make_exception_ptr(T)`. Note that the STL defines an ADL discovered free function `std::make_exception_ptr(T)` . Thus this trait will pick up that free function.

Namespace: `BOOST_OUTCOME_V2_NAMESPACE::trait`

Header: `<boost/outcome/trait.hpp>`

Variable alias: `is_exception_ptr_available_v<T>`

Last revised: October 10, 2019 at 18:14:56 +0100