third_party/boost/type_traits/doc/make_void.qbk

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Copyright 2017 Glen Joseph Fernandes
(glenjofe@gmail.com)

Distributed under the Boost Software License,
Version 1.0. (See accompanying file LICENSE_1_0.txt
or copy at http://www.boost.org/LICENSE_1_0.txt).
]

[section:make_void make_void]

    template<class...>
    struct make_void
    {
        typedef void type;
    };

    template<class... Ts>
    using void_t = typename make_void<Ts...>::type;

__type The type `void` for all `T`.

__header ` #include <boost/type_traits/make_void.hpp>` or ` #include <boost/type_traits.hpp>`

[table Examples

[[Expression] [Result Type]]

[[`make_void<int>::type`][`void`]]

[[`make_void<int&>::type`] [`void`]]

[[`make_void<int(*)(int)>::type`] [`void`]]

[[`make_void<int[]>::type`] [`void`]]

[[`make_void<int[1]>::type`] [`void`]]

[[`make_void<>::type`] [`void`]]

[[`make_void<int, int>::type`] [`void`]]

]

[all_compilers]  However, the type alias `void_t` is only available if the compiler supports template aliases.
Further, in the absence of variadic-template support, `make_void` only supports up to 5 parameters.

[endsect]