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https://github.com/boostorg/hana.git
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134 lines
3.2 KiB
C++
134 lines
3.2 KiB
C++
/*
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@copyright Louis Dionne 2015
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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/config.hpp>
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#include <boost/hana/core/datatype.hpp>
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#include <boost/hana/core/is_a.hpp>
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#include <boost/hana/integral_constant.hpp>
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#include <boost/hana/optional.hpp>
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#include <boost/hana/string.hpp>
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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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using boost::hana::size_t; // disambiguate with ::size_t on GCC
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//////////////////////////////////////////////////////////////////////////////
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// Modeled concepts
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//////////////////////////////////////////////////////////////////////////////
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{
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//! [Comparable]
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BOOST_HANA_CONSTANT_CHECK(
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BOOST_HANA_STRING("abcdef") == BOOST_HANA_STRING("abcdef")
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);
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BOOST_HANA_CONSTANT_CHECK(
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BOOST_HANA_STRING("abcdef") != BOOST_HANA_STRING("abef")
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);
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//! [Comparable]
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}{
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//! [Orderable]
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BOOST_HANA_CONSTANT_CHECK(
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BOOST_HANA_STRING("abc") < BOOST_HANA_STRING("bcd")
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);
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BOOST_HANA_CONSTANT_CHECK(
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BOOST_HANA_STRING("abcd") > BOOST_HANA_STRING("abc")
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);
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//! [Orderable]
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}{
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//! [Foldable]
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auto sum_string = [](auto str) {
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return fold.left(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_CHECK(
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sum_string(BOOST_HANA_STRING("1234")) == int_<1 + 2 + 3 + 4>
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);
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//! [Foldable]
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}{
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//! [Iterable]
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BOOST_HANA_CONSTANT_CHECK(!is_empty(BOOST_HANA_STRING("abcd")));
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BOOST_HANA_CONSTANT_CHECK(is_empty(BOOST_HANA_STRING("")));
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BOOST_HANA_CONSTANT_CHECK(BOOST_HANA_STRING("abcd")[int_<2>] == char_<'c'>);
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auto is_vowel = [](auto c) {
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return c ^in^ BOOST_HANA_STRING("aeiouy");
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};
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BOOST_HANA_CONSTANT_CHECK(
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drop_while(BOOST_HANA_STRING("aioubcd"), is_vowel) == BOOST_HANA_STRING("bcd")
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);
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//! [Iterable]
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}{
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//! [Searchable]
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BOOST_HANA_CONSTANT_CHECK(char_<'c'> ^in^ BOOST_HANA_STRING("abcde"));
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BOOST_HANA_CONSTANT_CHECK(!(char_<'z'> ^in^ BOOST_HANA_STRING("abcde")));
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BOOST_HANA_CONSTANT_CHECK(
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find(BOOST_HANA_STRING("abcxefg"), char_<'x'>) == just(char_<'x'>)
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);
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//! [Searchable]
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}
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//////////////////////////////////////////////////////////////////////////////
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// Methods
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//////////////////////////////////////////////////////////////////////////////
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{
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//! [BOOST_HANA_STRING]
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BOOST_HANA_CONSTEXPR_LAMBDA auto str = BOOST_HANA_STRING("abcdef");
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BOOST_HANA_CONSTANT_CHECK(str == string<'a', 'b', 'c', 'd', 'e', 'f'>);
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BOOST_HANA_CONSTANT_CHECK(is_a<String>(str));
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//! [BOOST_HANA_STRING]
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}{
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//! [string]
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constexpr auto str = string<'a', 'b', 'c', 'd', 'e', 'f'>;
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BOOST_HANA_CONSTANT_CHECK(is_a<String>(str));
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//! [string]
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}{
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//! [to<char const*>]
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constexpr auto str = string<'h', 'i'>;
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constexpr char const* s = to<char const*>(str);
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static_assert(s[0] == 'h' && s[1] == 'i' && s[2] == '\0', "");
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//! [to<char const*>]
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}{
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#ifdef BOOST_HANA_CONFIG_ENABLE_STRING_UDL
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//! [_s]
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using namespace boost::hana::literals;
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constexpr auto str = "Hello world!"_s;
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BOOST_HANA_CONSTANT_CHECK(is_a<String>(str));
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BOOST_HANA_CONSTANT_CHECK(length(str) == size_t<12>);
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//! [_s]
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#endif
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}
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}
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