46 lines
1.3 KiB
C++
46 lines
1.3 KiB
C++
// Copyright Louis Dionne 2013-2017
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/assert.hpp>
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#include <boost/hana/fwd/concept/integral_constant.hpp>
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#include <boost/hana/repeat.hpp>
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namespace hana = boost::hana;
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//////////////////////////////////////////////////////////////////////////////
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// Define a simple model of IntegralConstant for use below
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template <int i>
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struct constant {
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static constexpr int value = i;
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using value_type = int;
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};
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namespace boost { namespace hana {
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template <int i>
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struct IntegralConstant<constant<i>> {
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static constexpr bool value = true;
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};
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// definition of `to<>` omitted
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}}
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//////////////////////////////////////////////////////////////////////////////
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void function() { }
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int main() {
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int counter = 0;
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hana::repeat(constant<3>{}, [&] { ++counter; });
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BOOST_HANA_RUNTIME_CHECK(counter == 3);
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// Try with a normal function.
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hana::repeat(constant<3>{}, function);
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// Try with a function pointer.
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hana::repeat(constant<3>{}, static_cast<void(*)()>(function));
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// Make sure we don't read from a non-constexpr variable.
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constant<3> three{};
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hana::repeat(three, []{});
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}
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