28 lines
669 B
C++
28 lines
669 B
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/fold_left.hpp>
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#include <boost/hana/tuple.hpp>
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#include <sstream>
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namespace hana = boost::hana;
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auto to_string = [](auto x) {
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std::ostringstream ss;
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ss << x;
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return ss.str();
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};
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auto show = [](auto x, auto y) {
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return "(" + to_string(x) + " + " + to_string(y) + ")";
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};
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int main() {
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BOOST_HANA_RUNTIME_CHECK(
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hana::fold_left(hana::make_tuple(2, "3", '4'), "1", show) == "(((1 + 2) + 3) + 4)"
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);
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}
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