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[String] Add conversion to char const* and minor refactoring

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Also
- remove useless value_type alias in String since it's not a Constant
- document why the interface is so minimal
This commit is contained in:
Louis Dionne
2015-05-02 14:43:10 -04:00
parent 65834220b7
commit dc56f6cebc
9 changed files with 169 additions and 82 deletions
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143
example/string.cpp
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@@ -17,10 +17,85 @@ using namespace boost::hana;
int main() {
//////////////////////////////////////////////////////////////////////////////
// Modeled concepts
//////////////////////////////////////////////////////////////////////////////
{
//! [Comparable]
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abcdef") == BOOST_HANA_STRING("abcdef")
);
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abcdef") != BOOST_HANA_STRING("abef")
);
//! [Comparable]
}{
//! [Orderable]
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abc") < BOOST_HANA_STRING("bcd")
);
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abcd") > BOOST_HANA_STRING("abc")
);
//! [Orderable]
}{
//! [Foldable]
auto sum_string = [](auto str) {
return fold.left(str, int_<0>, [](auto sum, auto c) {
constexpr int i = value(c) - 48; // convert character to decimal
return sum + int_<i>;
});
};
BOOST_HANA_CONSTANT_CHECK(
sum_string(BOOST_HANA_STRING("1234")) == int_<1 + 2 + 3 + 4>
);
//! [Foldable]
}{
//! [Iterable]
BOOST_HANA_CONSTANT_CHECK(!is_empty(BOOST_HANA_STRING("abcd")));
BOOST_HANA_CONSTANT_CHECK(is_empty(BOOST_HANA_STRING("")));
BOOST_HANA_CONSTANT_CHECK(BOOST_HANA_STRING("abcd")[int_<2>] == char_<'c'>);
auto is_vowel = [](auto c) {
return c ^in^ BOOST_HANA_STRING("aeiouy");
};
BOOST_HANA_CONSTANT_CHECK(
drop_while(BOOST_HANA_STRING("aioubcd"), is_vowel) == BOOST_HANA_STRING("bcd")
);
//! [Iterable]
}{
//! [Searchable]
BOOST_HANA_CONSTANT_CHECK(char_<'c'> ^in^ BOOST_HANA_STRING("abcde"));
BOOST_HANA_CONSTANT_CHECK(!(char_<'z'> ^in^ BOOST_HANA_STRING("abcde")));
BOOST_HANA_CONSTANT_CHECK(
find(BOOST_HANA_STRING("abcxefg"), char_<'x'>) == just(char_<'x'>)
);
//! [Searchable]
}
//////////////////////////////////////////////////////////////////////////////
// Methods
//////////////////////////////////////////////////////////////////////////////
{
//! [BOOST_HANA_STRING]
BOOST_HANA_CONSTEXPR_LAMBDA auto str = BOOST_HANA_STRING("abcdef");
BOOST_HANA_CONSTANT_CHECK(str == string<'a', 'b', 'c', 'd', 'e', 'f'>);
static_assert(std::is_same<datatype_t<decltype(str)>, String>{}, "");
//! [BOOST_HANA_STRING]
@@ -33,69 +108,11 @@ static_assert(std::is_same<datatype_t<decltype(str)>, String>{}, "");
}{
//! [comparable]
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abcdef") == BOOST_HANA_STRING("abcdef")
);
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abcdef") != BOOST_HANA_STRING("abef")
);
//! [comparable]
}{
//! [orderable]
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abc") < BOOST_HANA_STRING("bcd")
);
BOOST_HANA_CONSTANT_CHECK(
BOOST_HANA_STRING("abcd") > BOOST_HANA_STRING("abc")
);
//! [orderable]
}{
//! [foldable]
auto sum_string = [](auto str) {
return fold.left(str, int_<0>, [](auto sum, auto c) {
constexpr int i = value(c) - 48; // convert character to decimal
return sum + int_<i>;
});
};
BOOST_HANA_CONSTANT_CHECK(
sum_string(BOOST_HANA_STRING("1234")) == int_<1 + 2 + 3 + 4>
);
//! [foldable]
}{
//! [iterable]
BOOST_HANA_CONSTANT_CHECK(!is_empty(BOOST_HANA_STRING("abcd")));
BOOST_HANA_CONSTANT_CHECK(is_empty(BOOST_HANA_STRING("")));
BOOST_HANA_CONSTANT_CHECK(BOOST_HANA_STRING("abcd")[int_<2>] == char_<'c'>);
auto is_vowel = [](auto c) {
return c ^in^ BOOST_HANA_STRING("aeiouy");
};
BOOST_HANA_CONSTANT_CHECK(
drop_while(BOOST_HANA_STRING("aioubcd"), is_vowel) == BOOST_HANA_STRING("bcd")
);
//! [iterable]
}{
//! [searchable]
BOOST_HANA_CONSTANT_CHECK(char_<'c'> ^in^ BOOST_HANA_STRING("abcde"));
BOOST_HANA_CONSTANT_CHECK(!(char_<'z'> ^in^ BOOST_HANA_STRING("abcde")));
BOOST_HANA_CONSTANT_CHECK(
find(BOOST_HANA_STRING("abcxefg"), char_<'x'>) == just(char_<'x'>)
);
//! [searchable]
//! [to<char const*>]
constexpr auto str = string<'h', 'i'>;
constexpr char const* s = to<char const*>(str);
static_assert(s[0] == 'h' && s[1] == 'i' && s[2] == '\0', "");
//! [to<char const*>]
}