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hana/example/list/foldable/unpack.cpp
2014-06-13 22:16:12 -04:00

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696 B
C++

/*
@copyright Louis Dionne 2014
Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
*/
#include <boost/hana/functional.hpp>
#include <boost/hana/list.hpp>
#include <cassert>
using namespace boost::hana;
int main() {
//! [main]
auto cheap_tie = [](auto& ...vars) {
return partial(unpack, [&vars...](auto ...values) {
int dummy[] = {((vars = values), 0)...};
(void)dummy;
});
};
int a = 0;
char b = '\0';
double c = 0;
cheap_tie(a, b, c)(list(1, '2', 3.3));
assert(a == 1);
assert(b == '2');
assert(c == 3.3);
//! [main]
}