initial commit

2022-03-05 00:30:50 -06:00
commit 8560c362a0
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--- a/include/utils/optional.h
+++ b/include/utils/optional.h
@@ -0,0 +1,105 @@
+/*
+  Copyright <2018-2022> <scott.e.graves@protonmail.com>
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+  associated documentation files (the "Software"), to deal in the Software without restriction,
+  including without limitation the rights to use, copy, modify, merge, publish, distribute,
+  sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in all copies or
+  substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+  NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+  OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#ifndef INCLUDE_UTILS_OPTIONAL_HPP_
+#define INCLUDE_UTILS_OPTIONAL_HPP_
+#if IS_DEBIAN9_DISTRO || !HAS_STD_OPTIONAL
+
+#include <memory>
+namespace std {
+class bad_optional_access : std::runtime_error {
+public:
+  bad_optional_access() : std::runtime_error("bad optional access") {}
+};
+
+template <typename t> class optional {
+public:
+  optional() = default;
+
+  explicit optional(const t &v) : val_(new t(v)) {}
+
+  explicit optional(t &&v) noexcept : val_(new t(std::move(v))) {}
+
+  optional(const optional &o) noexcept : val_(o.has_value() ? new t(o.val_) : nullptr) {}
+
+  optional(optional &&o) noexcept : val_(o.has_value() ? std::move(o.val_) : nullptr) {}
+
+private:
+  std::unique_ptr<t> val_;
+
+public:
+  bool has_value() const { return (val_ != nullptr); }
+
+  t &value() {
+    if (not has_value()) {
+      throw bad_optional_access();
+    }
+    return *val_;
+  }
+
+  const t &value() const {
+    if (not has_value()) {
+      throw bad_optional_access();
+    }
+    return *val_;
+  }
+
+  optional &operator=(const t &v) {
+    if (&v != val_.get()) {
+      val_.reset(new t(v));
+    }
+    return *this;
+  }
+
+  optional &operator=(const optional &v) {
+    if (&v != this) {
+      val_.reset(new t(v.has_value() ? v.value() : nullptr));
+    }
+    return *this;
+  }
+
+  optional &operator=(t &&v) noexcept {
+    if (&v != val_.get()) {
+      val_.reset(new t(std::move(v)));
+    }
+    return *this;
+  }
+
+  optional &operator=(optional &&v) noexcept {
+    if (&v != this) {
+      val_ = std::move(v);
+    }
+    return *this;
+  }
+
+  bool operator==(const optional &v) {
+    return (&v == this) || ((has_value() && v.has_value()) && (*val_ == *v.val_));
+  }
+
+  bool operator==(const t &v) { return has_value() && (v == *val_); }
+
+  bool operator!=(const optional &v) {
+    return (has_value() != v.has_value) || ((has_value() && v.has_value()) && (*val_ != *v.val_));
+  }
+
+  bool operator!=(const t &v) { return not has_value() || (v != *val_); }
+};
+} // namespace std
+
+#endif // IS_DEBIAN9_DISTRO || !HAS_STD_OPTIONAL
+#endif // INCLUDE_UTILS_OPTIONAL_HPP_