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90 lines
1.8 KiB
C++
90 lines
1.8 KiB
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/detail/constexpr.hpp>
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#include <boost/hana/maybe.hpp>
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#include <boost/hana/tuple.hpp>
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#include <boost/hana/type.hpp>
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#include <sstream>
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#include <string>
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#include <type_traits>
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using namespace boost::hana;
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int main() {
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{
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//! [adjust]
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BOOST_HANA_CONSTEXPR_LAMBDA auto negative = [](auto x) {
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return x < 0;
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};
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BOOST_HANA_CONSTEXPR_LAMBDA auto negate = [](auto x) {
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return -x;
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};
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BOOST_HANA_CONSTEXPR_CHECK(
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adjust(tuple(-3, -2, -1, 0, 1, 2, 3), negative, negate)
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==
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tuple(3, 2, 1, 0, 1, 2, 3)
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);
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//! [adjust]
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}{
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//! [fill]
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BOOST_HANA_CONSTEXPR_CHECK(
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fill(tuple(1, '2', 3.3, nullptr), 'x') == tuple('x', 'x', 'x', 'x')
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);
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BOOST_HANA_CONSTANT_CHECK(fill(nothing, 'x') == nothing);
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BOOST_HANA_CONSTEXPR_CHECK(fill(just('y'), 'x') == just('x'));
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//! [fill]
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}{
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//! [transform]
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auto to_string = [](auto x) {
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return static_cast<std::ostringstream const&>(std::ostringstream{} << x).str();
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};
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BOOST_HANA_RUNTIME_CHECK(
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transform(tuple(1, '2', "345", std::string{"67"}), to_string)
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==
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tuple("1", "2", "345", "67")
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);
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BOOST_HANA_CONSTANT_CHECK(transform(nothing, to_string) == nothing);
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BOOST_HANA_RUNTIME_CHECK(transform(just(123), to_string) == just("123"));
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BOOST_HANA_CONSTANT_CHECK(
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transform(tuple_t<void, int(), char[10]>, template_<std::add_pointer_t>)
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==
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tuple_t<void*, int(*)(), char(*)[10]>
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);
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//! [transform]
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}{
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//! [replace]
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BOOST_HANA_CONSTEXPR_LAMBDA auto negative = [](auto x) {
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return x < 0;
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};
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BOOST_HANA_CONSTEXPR_CHECK(
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replace(tuple(-3, -2, -1, 0, 1, 2, 3), negative, 0)
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==
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tuple(0, 0, 0, 0, 1, 2, 3)
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);
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//! [replace]
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}
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}
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