Initial commit

include/okapi/api/util/supplier.hpp

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+/*
+ * 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/.
+ */
+#pragma once
+
+#include <functional>
+
+namespace okapi {
+/**
+ * A supplier of instances of T.
+ *
+ * @tparam T the type to supply
+ */
+template <typename T> class Supplier {
+  public:
+  explicit Supplier(std::function<T(void)> ifunc) : func(ifunc) {
+  }
+
+  virtual ~Supplier() = default;
+
+  /**
+   * Get an instance of type T. This is usually a new instance, but it does not have to be.
+   * @return an instance of T
+   */
+  T get() const {
+    return func();
+  }
+
+  protected:
+  std::function<T(void)> func;
+};
+} // namespace okapi