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add string::rfind

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This commit is contained in:
bolero-MURAKAMI 2012-10-08 18:01:11 +09:00
parent 35f08fe242
commit 0651bf57d2
2 changed files with 72 additions and 5 deletions
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19
libs/string/test/string.cpp
View file

@ -133,12 +133,21 @@ namespace testspr {
// find
TESTSPR_BOTH_ASSERT(str1.find(str2) == decltype(str1)::npos);
TESTSPR_BOTH_ASSERT(str1.find(to_string("1234")) == 6);
TESTSPR_BOTH_ASSERT(str1.find(to_string("bar")) == 3);
TESTSPR_BOTH_ASSERT(str1.find(str2.c_str()) == decltype(str1)::npos);
TESTSPR_BOTH_ASSERT(str1.find("1234") == 6);
TESTSPR_BOTH_ASSERT(str1.find(str2.c_str(), 0, 4) == decltype(str1)::npos);
TESTSPR_BOTH_ASSERT(str1.find("12341234", 0, 4) == 6);
TESTSPR_BOTH_ASSERT(str1.find('1') == 6);
TESTSPR_BOTH_ASSERT(str1.find("bar") == 3);
TESTSPR_BOTH_ASSERT(str1.find(str2.c_str(), 0, 3) == decltype(str1)::npos);
TESTSPR_BOTH_ASSERT(str1.find("barbar", 0, 3) == 3);
TESTSPR_BOTH_ASSERT(str1.find('b') == 3);
// rfind
TESTSPR_BOTH_ASSERT(str1.rfind(str2) == decltype(str1)::npos);
TESTSPR_BOTH_ASSERT(str1.rfind(to_string("bar")) == 3);
TESTSPR_BOTH_ASSERT(str1.rfind(str2.c_str()) == decltype(str1)::npos);
TESTSPR_BOTH_ASSERT(str1.rfind("bar") == 3);
TESTSPR_BOTH_ASSERT(str1.rfind(str2.c_str(), decltype(str1)::npos, 3) == decltype(str1)::npos);
TESTSPR_BOTH_ASSERT(str1.rfind("barbar", decltype(str1)::npos, 3) == 3);
TESTSPR_BOTH_ASSERT(str1.rfind('b') == 3);
// substr
{

58
sprout/string/string.hpp
View file

@ -72,6 +72,30 @@ namespace sprout {
: npos
;
}
template<typename ConstIterator>
static SPROUT_CONSTEXPR size_type
rfind_impl_2(const_iterator data, size_type len, ConstIterator s, size_type pos, size_type n) {
return traits_type::compare(data + pos, s, n) == 0 ? pos
: pos > 0 ? rfind_impl_2(data, len, s, pos - 1, n)
: npos
;
}
template<typename ConstIterator>
static SPROUT_CONSTEXPR size_type
rfind_impl_1(const_iterator data, size_type len, ConstIterator s, size_type pos, size_type n) {
return n <= len ? rfind_impl_2(data, len, s, NS_SSCRISK_CEL_OR_SPROUT::min(size_type(len - n), pos), n)
: npos
;
}
static SPROUT_CONSTEXPR size_type
rfind_c_impl(const_iterator data, size_type len, value_type c) {
return len > 0
? traits_type::eq(data[len - 1], c)
? len - 1
: rfind_c_impl(data, len - 1, c)
: npos
;
}
static SPROUT_CONSTEXPR int
compare_impl_2(int compared, size_type n1, size_type n2) {
return compared != 0 ? compared
@ -369,6 +393,24 @@ namespace sprout {
: npos
;
}
SPROUT_CONSTEXPR size_type
rfind(basic_string const& str, size_type pos = npos) const SPROUT_NOEXCEPT {
return rfind_impl_1(begin(), len, str.begin(), pos, str.size());
}
SPROUT_CONSTEXPR size_type
rfind(value_type const* s, size_type pos, size_type n) const {
return rfind_impl_1(begin(), len, s, pos, n);
}
SPROUT_CONSTEXPR size_type
rfind(value_type const* s, size_type pos = npos) const {
return rfind(s, pos, traits_type::length(s));
}
SPROUT_CONSTEXPR size_type
rfind(value_type c, size_type pos = npos) const {
return len ? rfind_c_impl(begin(), len - 1 > pos ? pos + 1 : len, c)
: npos
;
}
SPROUT_CONSTEXPR basic_string
substr(size_type pos = 0, size_type n = npos) const {
return !(size() < pos)
@ -487,6 +529,22 @@ namespace sprout {
return find(s, pos, traits_type::length(s));
}
template<typename ConstIterator>
SPROUT_CONSTEXPR typename std::enable_if<
sprout::is_index_iterator<ConstIterator>::value,
size_type
>::type
rfind(ConstIterator s, size_type pos, size_type n) const {
return rfind_impl_1(begin(), len, s, pos, n);
}
template<typename ConstIterator>
SPROUT_CONSTEXPR typename std::enable_if<
sprout::is_index_iterator<ConstIterator>::value,
size_type
>::type
rfind(ConstIterator s, size_type pos = npos) const {
return rfind(s, pos, traits_type::length(s));
}
template<typename ConstIterator>
SPROUT_CONSTEXPR typename std::enable_if<
sprout::is_index_iterator<ConstIterator>::value,
int