blob: cecc97c73a92d10a39d0a77d6235441d8126d6bb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*!
@file
Forward declares `boost::hana::fuse`.
@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#ifndef BOOST_HANA_FWD_FUSE_HPP
#define BOOST_HANA_FWD_FUSE_HPP
#include <boost/hana/config.hpp>
BOOST_HANA_NAMESPACE_BEGIN
//! Transform a function taking multiple arguments into a function that
//! can be called with a compile-time `Foldable`.
//! @ingroup group-Foldable
//!
//!
//! This function is provided for convenience as a different way of
//! calling `unpack`. Specifically, `fuse(f)` is a function such that
//! @code
//! fuse(f)(foldable) == unpack(foldable, f)
//! == f(x...)
//! @endcode
//! where `x...` are the elements in the foldable. This function is
//! useful when one wants to create a function that accepts a foldable
//! which is not known yet.
//!
//! @note
//! This function is not tag-dispatched; customize `unpack` instead.
//!
//!
//! Example
//! -------
//! @include example/fuse.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto fuse = [](auto&& f) {
return [perfect-capture](auto&& xs) -> decltype(auto) {
return unpack(forwarded(xs), forwarded(f));
};
};
#else
struct fuse_t {
template <typename F>
constexpr auto operator()(F&& f) const;
};
constexpr fuse_t fuse{};
#endif
BOOST_HANA_NAMESPACE_END
#endif // !BOOST_HANA_FWD_FUSE_HPP
|
