Stufen

Bemerkung:
mit Columbo Integrität von
Datenbanken Interaktion und
Portierbarkeit Ergonomie der
Schnittstellen

Angebot Produkte Projekt Beratung

Mittel Analytik Modellierung Sprachen Algebra Logik Hardware Denken Kreativität

Zusammenhänge Gesellschaft Wirtschaft Branche Firma


Quellcodebibliothek Statistik Leitseite products/sources/formale Sprachen/C/Firefox/mfbt/ (Browser von der Mozilla Stiftung Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 4 kB

Quelle Algorithm.h Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/* A polyfill for `<algorithm>`. */

#ifndef mozilla_Algorithm_h
#define mozilla_Algorithm_h

#include "mozilla/Result.h"

#include <iterator>
#include <type_traits>

namespace mozilla {

// Returns true if all elements in the range [aFirst, aLast)
// satisfy the predicate aPred.
template <class Iter, class Pred>
constexpr bool AllOf(Iter aFirst, Iter aLast, Pred aPred) {
  for (; aFirst != aLast; ++aFirst) {
    if (!aPred(*aFirst)) {
      return false;
    }
  }
  return true;
}

// Like C++20's `std::any_of`.
template <typename Iter, typename Pred>
constexpr bool AnyOf(Iter aFirst, Iter aLast, Pred aPred) {
  for (; aFirst != aLast; ++aFirst) {
    if (aPred(*aFirst)) {
      return true;
    }
  }

  return false;
}

namespace detail {
template <typename Transform, typename SrcIter>
using ArrayElementTransformType = typename std::invoke_result_t<
    Transform, typename std::iterator_traits<SrcIter>::reference>;

template <typename Transform, typename SrcIter>
struct TransformTraits {
  using result_type = ArrayElementTransformType<Transform, SrcIter>;

  using result_ok_type = typename result_type::ok_type;
  using result_err_type = typename result_type::err_type;
};
}  // namespace detail

// An algorithm similar to TransformAbortOnErr combined with a condition that
// allows to skip elements. At most std::distance(aIter, aEnd) elements will be
// inserted into aDst.
//
// Type requirements, in addition to those specified in TransformAbortOnErr:
// - Cond must be compatible with signature
//   bool (const SrcIter::value_type&)
template <typename SrcIter, typename DstIter, typename Cond, typename Transform>
Result<Ok,
       typename detail::TransformTraits<Transform, SrcIter>::result_err_type>
TransformIfAbortOnErr(SrcIter aIter, SrcIter aEnd, DstIter aDst, Cond aCond,
                      Transform aTransform) {
  for (; aIter != aEnd; ++aIter) {
    if (!aCond(static_cast<std::add_const_t<
                   typename std::iterator_traits<SrcIter>::value_type>&>(
            *aIter))) {
      continue;
    }

    auto res = aTransform(*aIter);
    if (res.isErr()) {
      return Err(res.unwrapErr());
    }

    *aDst++ = res.unwrap();
  }
  return Ok{};
}

template <typename SrcRange, typename DstIter, typename Cond,
          typename Transform>
auto TransformIfAbortOnErr(SrcRange& aRange, DstIter aDst, Cond aCond,
                           Transform aTransform) {
  using std::begin;
  using std::end;
  return TransformIfAbortOnErr(begin(aRange), end(aRange), aDst, aCond,
                               aTransform);
}

// An algorithm similar to std::transform, adapted to error handling based on
// mozilla::Result<V, E>. It iterates through the input range [aIter, aEnd) and
// inserts the result of applying aTransform to each element into aDst, if
// aTransform returns a success result. On the first error result, iterating is
// aborted, and the error result is returned as an overall result. If all
// transformations return a success result, Ok is returned as an overall result.
//
// Type requirements:
// - SrcIter must be an InputIterator.
// - DstIter must be an OutputIterator.
// - Transform must be compatible with signature
//   Result<DstIter::value_type, E> (SrcIter::reference)
template <typename SrcIter, typename DstIter, typename Transform>
Result<Ok,
       typename detail::TransformTraits<Transform, SrcIter>::result_err_type>
TransformAbortOnErr(SrcIter aIter, SrcIter aEnd, DstIter aDst,
                    Transform aTransform) {
  return TransformIfAbortOnErr(
      aIter, aEnd, aDst, [](const auto&) { return true; }, aTransform);
}

template <typename SrcRange, typename DstIter, typename Transform>
auto TransformAbortOnErr(SrcRange& aRange, DstIter aDst, Transform aTransform) {
  using std::begin;
  using std::end;
  return TransformIfAbortOnErr(
      begin(aRange), end(aRange), aDst, [](const auto&) { return true; },
      aTransform);
}

}  // namespace mozilla

#endif  // mozilla_Algorithm_h

quality93%

¤ Dauer der Verarbeitung: 0.21 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.