mirror of
https://github.com/boostorg/hana.git
synced 2026-02-18 02:02:09 +00:00
28 lines
685 B
C++
28 lines
685 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/list/instance.hpp>
|
|
|
|
#include <cassert>
|
|
#include <sstream>
|
|
using namespace boost::hana;
|
|
|
|
|
|
int main() {
|
|
//! [main]
|
|
std::stringstream before, after;
|
|
|
|
auto xs = list(1, 2, 3)
|
|
| tap<List>([&](auto x) { before << x << ' '; })
|
|
| [](auto x) { return list(x, -x); }
|
|
| tap<List>([&](auto x) { after << x << ' '; });
|
|
|
|
assert(before.str() == "1 2 3 ");
|
|
assert(after.str() == "1 -1 2 -2 3 -3 ");
|
|
assert(xs == list(1, -1, 2, -2, 3, -3));
|
|
//! [main]
|
|
}
|