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hana/example/lazy/lazy.cpp
2014-07-16 16:26:23 -04:00

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652 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/bool.hpp>
#include <boost/hana/detail/constexpr.hpp>
#include <boost/hana/detail/static_assert.hpp>
#include <boost/hana/lazy.hpp>
using namespace boost::hana;
int main() {
//! [main]
BOOST_HANA_CONSTEXPR_LAMBDA auto f = lazy([](auto x) {
return 1 / x;
});
BOOST_HANA_CONSTEXPR_LAMBDA auto g = lazy([](auto x) {
return x + 1;
});
BOOST_HANA_STATIC_ASSERT(eval(if_(false_, f(0), g(0))) == 0 + 1);
//! [main]
}