default_construct_copyable_movable.hpp

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#pragma once
 
#include <utility>
 
// A wrapper for noncopyable/nonmovable types that resorts to default-constructing in copy/move constructors
// and immutability in assignment operators
// This basically captures a common work-around pattern for classes that contain fields of this kind of types
// - a famous example would be a mutex type
 
namespace taraxa::util {
 
template <typename T>
struct DefaultConstructCopyableMovable {
  T val;
 
  DefaultConstructCopyableMovable() = default;
  ~DefaultConstructCopyableMovable() = default;
 
  DefaultConstructCopyableMovable(T val) : val(std::move(val)) {}
  DefaultConstructCopyableMovable(const DefaultConstructCopyableMovable&) noexcept(noexcept(T())) : val() {}
  DefaultConstructCopyableMovable(DefaultConstructCopyableMovable&&) noexcept(noexcept(T())) : val() {}
 
  DefaultConstructCopyableMovable& operator=(const DefaultConstructCopyableMovable&) noexcept { return *this; }
  DefaultConstructCopyableMovable& operator=(DefaultConstructCopyableMovable&&) noexcept { return *this; }
};
 
}  // namespace taraxa::util