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27 lines
686 B
C++
27 lines
686 B
C++
/*
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@copyright Louis Dionne 2014
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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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*/
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#include <boost/hana/assert.hpp>
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#include <boost/hana/integral.hpp>
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#include <boost/hana/string.hpp>
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using namespace boost::hana;
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int main() {
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//! [main]
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auto sum_string = [](auto str) {
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return foldl(str, int_<0>, [](auto sum, auto c) {
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constexpr int i = value(c) - 48; // convert character to decimal
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return sum + int_<i>;
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});
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};
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BOOST_HANA_CONSTANT_ASSERT(
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sum_string(BOOST_HANA_STRING("1234")) == int_<1 + 2 + 3 + 4>
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);
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//! [main]
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}
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