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ICU-23004 sample code for API docs etc.

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This commit is contained in:
Markus Scherer 2025-03-07 14:20:01 -08:00
parent bb66c8c338
commit c60546528f
2 changed files with 82 additions and 10 deletions
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16
icu4c/source/common/unicode/utfiter.h
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@ -1891,9 +1891,7 @@ int32_t rangeLoop16(std::u16string_view s) {
int32_t loopIterPlusPlus16(std::u16string_view s) {
auto range = header::utfStringCodePoints<UChar32, U_BEHAVIOR_NEGATIVE>(s);
int32_t sum = 0;
auto iter = range.begin();
auto limit = range.end();
while (iter != limit) {
for (auto iter = range.begin(), limit = range.end(); iter != limit;) {
sum += (*iter++).codePoint();
}
return sum;
@ -1902,9 +1900,7 @@ int32_t loopIterPlusPlus16(std::u16string_view s) {
int32_t backwardLoop16(std::u16string_view s) {
auto range = header::utfStringCodePoints<UChar32, U_BEHAVIOR_NEGATIVE>(s);
int32_t sum = 0;
auto start = range.begin();
auto iter = range.end();
while (start != iter) {
for (auto start = range.begin(), iter = range.end(); start != iter;) {
sum += (*--iter).codePoint();
}
return sum;
@ -1913,7 +1909,7 @@ int32_t backwardLoop16(std::u16string_view s) {
int32_t reverseLoop16(std::u16string_view s) {
auto range = header::utfStringCodePoints<UChar32, U_BEHAVIOR_NEGATIVE>(s);
int32_t sum = 0;
for (auto iter = range.rbegin(); iter != range.rend(); ++iter) {
for (auto iter = range.rbegin(), limit = range.rend(); iter != limit; ++iter) {
sum += iter->codePoint();
}
return sum;
@ -1930,7 +1926,7 @@ int32_t unsafeRangeLoop16(std::u16string_view s) {
int32_t unsafeReverseLoop16(std::u16string_view s) {
auto range = header::unsafeUTFStringCodePoints<UChar32>(s);
int32_t sum = 0;
for (auto iter = range.rbegin(); iter != range.rend(); ++iter) {
for (auto iter = range.rbegin(), limit = range.rend(); iter != limit; ++iter) {
sum += iter->codePoint();
}
return sum;
@ -1947,7 +1943,7 @@ int32_t rangeLoop8(std::string_view s) {
int32_t reverseLoop8(std::string_view s) {
auto range = header::utfStringCodePoints<UChar32, U_BEHAVIOR_NEGATIVE>(s);
int32_t sum = 0;
for (auto iter = range.rbegin(); iter != range.rend(); ++iter) {
for (auto iter = range.rbegin(), limit = range.rend(); iter != limit; ++iter) {
sum += iter->codePoint();
}
return sum;
@ -1975,7 +1971,7 @@ int32_t unsafeRangeLoop8(std::string_view s) {
int32_t unsafeReverseLoop8(std::string_view s) {
auto range = header::unsafeUTFStringCodePoints<UChar32>(s);
int32_t sum = 0;
for (auto iter = range.rbegin(); iter != range.rend(); ++iter) {
for (auto iter = range.rbegin(), limit = range.rend(); iter != limit; ++iter) {
sum += iter->codePoint();
}
return sum;

76
icu4c/source/test/intltest/utfitertest.cpp
View file

@ -25,6 +25,82 @@ using U_HEADER_ONLY_NAMESPACE::utfIterator;
using U_HEADER_ONLY_NAMESPACE::UTFStringCodePoints;
using U_HEADER_ONLY_NAMESPACE::utfStringCodePoints;
#ifdef SAMPLE_CODE
// For API docs etc. Compile when changing samples or APIs.
using U_HEADER_ONLY_NAMESPACE::unsafeUTFIterator;
using U_HEADER_ONLY_NAMESPACE::unsafeUTFStringCodePoints;
int32_t rangeLoop16(std::u16string_view s) {
int32_t sum = 0;
for (auto units : utfStringCodePoints<UChar32, U_BEHAVIOR_NEGATIVE>(s)) {
sum += units.codePoint(); // < 0 if ill-formed
}
return sum;
}
int32_t loopIterPlusPlus16(std::u16string_view s) {
auto range = utfStringCodePoints<char32_t, U_BEHAVIOR_FFFD>(s);
int32_t sum = 0;
for (auto iter = range.begin(), limit = range.end(); iter != limit;) {
sum += (*iter++).codePoint(); // U+FFFD if ill-formed
}
return sum;
}
int32_t backwardLoop16(std::u16string_view s) {
auto range = utfStringCodePoints<UChar32, U_BEHAVIOR_SURROGATE>(s);
int32_t sum = 0;
for (auto start = range.begin(), iter = range.end(); start != iter;) {
sum += (*--iter).codePoint(); // surrogate code point if unpaired / ill-formed
}
return sum;
}
int32_t reverseLoop8(std::string_view s) {
auto range = utfStringCodePoints<char32_t, U_BEHAVIOR_FFFD>(s);
int32_t sum = 0;
for (auto iter = range.rbegin(), limit = range.rend(); iter != limit; ++iter) {
sum += iter->codePoint(); // U+FFFD if ill-formed
}
return sum;
}
int32_t unsafeRangeLoop16(std::u16string_view s) {
int32_t sum = 0;
for (auto units : unsafeUTFStringCodePoints<UChar32>(s)) {
sum += units.codePoint();
}
return sum;
}
int32_t unsafeReverseLoop8(std::string_view s) {
auto range = unsafeUTFStringCodePoints<UChar32>(s);
int32_t sum = 0;
for (auto iter = range.rbegin(), limit = range.rend(); iter != limit; ++iter) {
sum += iter->codePoint();
}
return sum;
}
char32_t firstCodePointOrFFFD16(std::u16string_view s) {
if (s.empty()) { return 0xfffd; }
auto range = utfStringCodePoints<char32_t, U_BEHAVIOR_FFFD>(s);
return range.begin()->codePoint();
}
std::string_view firstSequence8(std::string_view s) {
if (s.empty()) { return {}; }
auto range = utfStringCodePoints<char32_t, U_BEHAVIOR_FFFD>(s);
auto units = *(range.begin());
if (units.wellFormed()) {
return units.stringView();
} else {
return {};
}
}
#endif // SAMPLE_CODE
// Shared state for one or more copies of single-pass iterators.
// Similar to https://en.cppreference.com/w/cpp/iterator/istreambuf_iterator
// but the iterators only implement LegacyIterator (* and ++) without post-increment.