mirror of https://github.com/orefkov/simstr.git
Update description.
Improve signed integer to string conversion.
This commit is contained in:
Aleksandr Orefkov
parent
9b668edf24
commit
07760fc2b6
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@ -1402,10 +1402,8 @@ concept ToIntNumber = FromIntNumber<T> || is_one_of_type<T, int8_t>::value;
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template<typename K, bool I, typename T>
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struct need_sign { // NOLINT
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bool negate;
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need_sign(T& t) : negate(t < 0) {
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if (negate && t != std::numeric_limits<T>::min())
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t = -t;
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}
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std::make_unsigned_t<T> val;
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need_sign(T t) : negate(t < 0), val(t < 0 ? std::make_unsigned_t<T>{} - t : t) {}
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void after(K*& ptr) {
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if (negate)
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*--ptr = '-';
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@ -1414,7 +1412,8 @@ struct need_sign { // NOLINT
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template<typename K, typename T>
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struct need_sign<K, false, T> {
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need_sign(T&) {}
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T val;
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need_sign(T t) : val(t){}
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void after(K*&) {}
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};
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@ -1427,35 +1426,22 @@ constexpr size_t fromInt(K* bufEnd, T val) {
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"6061626364656667686970717273747576777879"
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"8081828384858687888990919293949596979899";
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if (val) {
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need_sign<K, std::is_signed_v<T>, T> sign(val);
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need_sign<K, std::is_signed_v<T>, T> store(val);
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K* itr = bufEnd;
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// Когда у нас минимальное отрицательное число, оно не меняется и остается меньше нуля
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// When we have a minimum negative number, it does not change and remains less than zero
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if constexpr (std::is_signed_v<T>) {
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if (val < 0) {
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// Возьмем две последние цифры
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// Take the last two digits
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const char* ptr = twoDigit - (val % 100) * 2;
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*--itr = static_cast<K>(ptr[1]);
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*--itr = static_cast<K>(ptr[0]);
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val /= 100;
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val = -val;
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}
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}
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while (val >= 100) {
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const char* ptr = twoDigit + (val % 100) * 2;
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while (store.val >= 100) {
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const char* ptr = twoDigit + (store.val % 100) * 2;
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*--itr = static_cast<K>(ptr[1]);
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*--itr = static_cast<K>(ptr[0]);
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val /= 100;
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store.val /= 100;
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}
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if (val < 10) {
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*--itr = static_cast<K>('0' + val);
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if (store.val < 10) {
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*--itr = static_cast<K>('0' + store.val);
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} else {
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const char* ptr = twoDigit + val * 2;
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const char* ptr = twoDigit + store.val * 2;
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*--itr = static_cast<K>(ptr[1]);
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*--itr = static_cast<K>(ptr[0]);
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}
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sign.after(itr);
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store.after(itr);
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return size_t(bufEnd - itr);
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}
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bufEnd[-1] = '0';
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22
readme.md
22
readme.md
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@ -288,7 +288,27 @@ You can connect as a CMake project via `add_subdirectory` (the `simstr` library)
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you can simply include the files in your project. Building also requires [simdutf](https://github.com/simdutf/simdutf) (when using CMake
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it is downloaded automatically).
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The library is included in [vcpkg](https://vcpkg.io), connected as `orefkov-simstr`.
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### Using FetchContent
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```
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function(add_simstr)
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set(SIMSTR_BUILD_TESTS OFF)
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set(SIMSTR_BENCHMARKS OFF)
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FetchContent_Declare(
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simstr
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GIT_REPOSITORY https://github.com/orefkov/simstr.git
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GIT_SHALLOW TRUE
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GIT_TAG tags/rel1.4.0 # Укажите нужный релиз
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FIND_PACKAGE_ARGS NAMES simstr 1.4.0
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)
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FetchContent_MakeAvailable(simstr)
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endfunction()
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add_simstr()
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target_link_libraries(<your target> PUBLIC simstr::simstr)
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```
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The library is also included in [vcpkg](https://vcpkg.io), connected as `orefkov-simstr`.
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`simstr` requires a compiler of at least the C++20 standard - concepts and std::format are used.
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The work was tested under Windows on MSVC-19 and Clang-19, under Linux - on GCC-13 and Clang-21.
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22
readme_ru.md
22
readme_ru.md
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@ -289,7 +289,27 @@ int split_and_calc_total_sim(ssa numbers, ssa delimiter) {
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можно просто включить файлы в свой проект. Для сборки также требуется [simdutf](https://github.com/simdutf/simdutf) (при использовании CMake
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скачивается автоматически).
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Библиотека включена в [vcpkg](https://vcpkg.io), подключается как `orefkov-simstr`.
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### Подключение через FetchContent
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```
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function(add_simstr)
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set(SIMSTR_BUILD_TESTS OFF)
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set(SIMSTR_BENCHMARKS OFF)
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FetchContent_Declare(
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simstr
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GIT_REPOSITORY https://github.com/orefkov/simstr.git
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GIT_SHALLOW TRUE
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GIT_TAG tags/rel1.4.0 # Укажите нужный релиз
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FIND_PACKAGE_ARGS NAMES simstr 1.4.0
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)
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FetchContent_MakeAvailable(simstr)
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endfunction()
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add_simstr()
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target_link_libraries(<your target> PUBLIC simstr::simstr)
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```
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Библиотека также включена в [vcpkg](https://vcpkg.io), подключается как `orefkov-simstr`.
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Для работы `simstr` требуется компилятор стандарта не ниже С++20 - используются концепты и std::format.
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Работа проверялась под Windows на MSVC-19 и Clang-19, под Linux - на GCC-13 и Clang-21.
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