From 6a27a2a4032e88fa9154ef0f0741edc584f7a701 Mon Sep 17 00:00:00 2001
From: Dominick Allen <djallen@librehumanitas.org>
Date: Sun, 20 Oct 2024 10:48:19 -0500
Subject: Lots of work.

---
 include/fud_algorithm.hpp | 162 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 include/fud_algorithm.hpp

(limited to 'include/fud_algorithm.hpp')

diff --git a/include/fud_algorithm.hpp b/include/fud_algorithm.hpp
new file mode 100644
index 0000000..e3d5d3b
--- /dev/null
+++ b/include/fud_algorithm.hpp
@@ -0,0 +1,162 @@
+/*
+ * libfud
+ * Copyright 2024 Dominick Allen
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FUD_ALGORITHM_HPP
+#define FUD_ALGORITHM_HPP
+
+#include "fud_span.hpp"
+
+#include <concepts>
+#include <limits>
+#include <optional>
+#include <type_traits>
+
+namespace fud {
+
+template <std::integral T>
+class Iota {
+  public:
+    constexpr Iota() noexcept : m_value{}, m_increment{static_cast<T>(1)}, m_limit{std::numeric_limits<T>::max()}
+    {
+    }
+
+    constexpr Iota(T value) noexcept :
+        m_value{value}, m_increment{static_cast<T>(1)}, m_limit{std::numeric_limits<T>::max()}
+    {
+    }
+
+    constexpr Iota(T value, T increment) noexcept :
+        m_value{value}, m_increment{increment}, m_limit{std::numeric_limits<T>::max()}
+    {
+    }
+
+    constexpr Iota(T value, T increment, T limit) noexcept : m_value{value}, m_increment{increment}, m_limit{limit}
+    {
+    }
+
+    constexpr std::optional<T> operator()() noexcept
+    {
+        auto value = m_value;
+        if (m_increment > 0) {
+            if (m_limit - m_increment < m_value) {
+                return std::nullopt;
+            }
+        } else {
+            if (m_limit + m_increment + 1 >= m_value) {
+                return std::nullopt;
+            }
+        }
+        m_value += m_increment;
+        return value;
+    }
+
+    void set(T value) {
+        m_value = value;
+    }
+
+  private:
+    T m_value;
+    const T m_increment;
+    const T m_limit;
+};
+
+template <typename T, size_t Size, typename Func>
+Span<T, Size> forEach(Span<T, Size> input, Func&& mapFunc)
+{
+    for (auto& element : input) {
+        element = std::forward<Func>(mapFunc)(element);
+    }
+
+    return input;
+}
+
+template <typename T, typename U, size_t Size, typename Func>
+Span<T, Size> mapTo(Span<T, Size> input, Span<U, Size> output, Func&& mapFunc)
+{
+    for (auto idx = 0; idx < input.size(); ++idx) {
+        output[idx] = std::forward<Func>(mapFunc)(input[idx]);
+    }
+
+    return input;
+}
+
+template <typename T, size_t Size, typename Func, typename Builder, typename Output>
+auto map(Span<T, Size> input, Func&& mapFunc, Builder&& builder) -> decltype(std::forward<Builder>(builder)())
+{
+    Output output{std::forward<Builder>(builder)()};
+    for (auto idx = 0; idx < input.size() && idx < output.size(); ++idx) {
+        output[idx] = std::forward<Func>(mapFunc)(input[idx]);
+    }
+
+    return input;
+}
+
+template <typename Generator, typename Builder>
+auto generate(Builder&& builder, Generator&& generator) -> decltype(std::forward<Builder>(builder)())
+{
+    using Output = decltype(std::forward<Builder>(builder)());
+    Output output{std::forward<Builder>(builder)()};
+    for (auto idx = 0; idx < output.size(); ++idx) {
+        output[idx] = std::forward<Generator>(generator)();
+    }
+
+    return output;
+}
+
+template <typename T, size_t Size, typename Func>
+bool allOf(Span<T, Size> input, Func&& predicate)
+{
+    bool result = input.size() > 0;
+    for (size_t idx = 0; result && idx < input.size(); ++idx) {
+        result = result && std::forward<Func>(predicate)(input[idx]);
+    }
+    return result;
+}
+
+template <typename Generator, typename Func>
+bool allOf(Generator&& generator, Func&& predicate)
+{
+    bool result = true;
+    while (auto val = std::forward<Generator>(generator)()) {
+        result = result && std::forward<Func>(predicate)(*val);
+    }
+    return result;
+}
+
+template <typename T, size_t Size, typename Func>
+bool anyOf(Span<T, Size> input, Func&& predicate)
+{
+    bool result = !(input.size() > 0);
+    for (size_t idx = 0; result && idx < input.size(); ++idx) {
+        result = result || std::forward<Func>(predicate)(input[idx]);
+    }
+    return result;
+}
+
+template <typename Generator, typename Func>
+bool anyOf(Generator&& generator, Func&& predicate)
+{
+    bool result = false;
+    while (auto val = std::forward<Generator>(generator)()) {
+        result = result || std::forward<Func>(predicate)(*val);
+    }
+    return result;
+}
+
+} // namespace fud
+
+#endif
-- 
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