Added thirdparty: boost library

thirdparty/include/boost/hana/fwd/for_each.hpp

@@ -0,0 +1,55 @@
+/*!
+@file
+Forward declares `boost::hana::for_each`.
+
+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_FOR_EACH_HPP
+#define BOOST_HANA_FWD_FOR_EACH_HPP
+
+#include <boost/hana/config.hpp>
+#include <boost/hana/core/when.hpp>
+
+
+namespace boost { namespace hana {
+    //! Perform an action on each element of a foldable, discarding
+    //! the result each time.
+    //! @ingroup group-Foldable
+    //!
+    //! Iteration is done from left to right, i.e. in the same order as when
+    //! using `fold_left`. If the structure is not finite, this method will
+    //! not terminate.
+    //!
+    //!
+    //! @param xs
+    //! The structure to iterate over.
+    //!
+    //! @param f
+    //! A function called as `f(x)` for each element `x` of the structure.
+    //! The result of `f(x)`, whatever it is, is ignored.
+    //!
+    //!
+    //! Example
+    //! -------
+    //! @include example/for_each.cpp
+#ifdef BOOST_HANA_DOXYGEN_INVOKED
+    constexpr auto for_each = [](auto&& xs, auto&& f) -> void {
+        tag-dispatched;
+    };
+#else
+    template <typename T, typename = void>
+    struct for_each_impl : for_each_impl<T, when<true>> { };
+
+    struct for_each_t {
+        template <typename Xs, typename F>
+        constexpr void operator()(Xs&& xs, F&& f) const;
+    };
+
+    BOOST_HANA_INLINE_VARIABLE constexpr for_each_t for_each{};
+#endif
+}} // end namespace boost::hana
+
+#endif // !BOOST_HANA_FWD_FOR_EACH_HPP