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/*!
@file
Forward declares `boost::hana::insert`.
Copyright Louis Dionne 2013-2022
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_INSERT_HPP
#define BOOST_HANA_FWD_INSERT_HPP
#include <boost/hana/config.hpp>
#include <boost/hana/core/when.hpp>
namespace boost { namespace hana {
// Note: This function is documented per datatype/concept only.
//! @cond
template <typename T, typename = void>
struct insert_impl : insert_impl<T, when<true>> { };
//! @endcond
struct insert_t {
template <typename Set, typename ...Args>
constexpr decltype(auto) operator()(Set&& set, Args&& ...args) const;
};
BOOST_HANA_INLINE_VARIABLE constexpr insert_t insert{};
//! Insert a value at a given index in a sequence.
//! @ingroup group-Sequence
//!
//! Given a sequence, an index and an element to insert, `insert` inserts
//! the element at the given index.
//!
//! @param xs
//! The sequence in which a value should be inserted.
//!
//! @param n
//! The index at which an element should be inserted. This must be a
//! non-negative `Constant` of an integral type, and it must also be
//! true that `n < length(xs)` if `xs` is a finite sequence.
//!
//! @param element
//! The element to insert in the sequence.
//!
//!
//! Example
//! -------
//! @include example/insert.cpp
#ifdef BOOST_HANA_DOXYGEN_INVOKED
constexpr auto insert = [](auto&& xs, auto&& n, auto&& element) {
return tag-dispatched;
};
#endif
}} // end namespace boost::hana
#endif // !BOOST_HANA_FWD_INSERT_HPP
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