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hana/example/maybe/traversable.cpp
Louis Dionne 307d3d0ec8 Huge reorganization and refactoring.
- Split type class instances into separate files
- Instances provided automatically by a type class are actually MCDs
- Test each instance in a single file, not one file per method
- Refactor the operator system to fix the ADL-related bug.
2014-08-18 19:26:29 -04:00

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/*
@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/detail/assert.hpp>
#include <boost/hana/detail/constexpr.hpp>
#include <boost/hana/maybe.hpp>
#include <boost/hana/tuple.hpp>
using namespace boost::hana;
int main() {
//! [main]
BOOST_HANA_CONSTEXPR_LAMBDA auto replicate3 = [](auto x) {
return tuple(x, x, x);
};
BOOST_HANA_CONSTEXPR_ASSERT(traverse<Tuple>(replicate3, just(1)) == tuple(just(1), just(1), just(1)));
BOOST_HANA_CONSTANT_ASSERT(traverse<Tuple>(replicate3, nothing) == tuple(nothing));
//! [main]
}