lttng: start: ensure a cmd_error_code is returned by the command

[lttng-tools.git] / src / bin / lttng / utils.hpp

diff --git a/src/bin/lttng/utils.hpp b/src/bin/lttng/utils.hpp
index c3b442056cc1ecc6d88d518089c3168ea00679e0..4fa15c38d2f26a689e93d34c8896d7e1b8fb8bdc 100644 (file)
--- a/src/bin/lttng/utils.hpp
+++ b/src/bin/lttng/utils.hpp
@@ -40,56 +40,60 @@ struct session_spec {
  * We don't use a std::vector here because it would make a copy of the C array.
  */
 class session_list {
-       class iterator : public std::iterator<std::random_access_iterator_tag, std::size_t> {
+       template <typename ContainerType, typename DereferenceReturnType>
+       class iterator_template : public std::iterator<std::random_access_iterator_tag, std::size_t> {
        public:
-               explicit iterator(session_list& list, std::size_t k) : _list(list), _index(k)
+               explicit iterator_template(ContainerType& list, std::size_t k) : _list(list), _index(k)
                {
                }
 
-               iterator& operator++() noexcept
+               iterator_template& operator++() noexcept
                {
                        ++_index;
                        return *this;
                }
 
-               iterator& operator--() noexcept
+               iterator_template& operator--() noexcept
                {
                        --_index;
                        return *this;
                }
 
-               iterator& operator++(int) noexcept
+               iterator_template& operator++(int) noexcept
                {
                        _index++;
                        return *this;
                }
 
-               iterator& operator--(int) noexcept
+               iterator_template& operator--(int) noexcept
                {
                        _index--;
                        return *this;
                }
 
-               bool operator==(iterator other) const noexcept
+               bool operator==(iterator_template other) const noexcept
                {
                        return _index == other._index;
                }
 
-               bool operator!=(iterator other) const noexcept
+               bool operator!=(iterator_template other) const noexcept
                {
                        return !(*this == other);
                }
 
-               lttng_session& operator*() const noexcept
+               DereferenceReturnType& operator*() const noexcept
                {
                        return _list[_index];
                }
 
        private:
-               session_list& _list;
+               ContainerType& _list;
                std::size_t _index;
        };
 
+       using iterator = iterator_template<session_list, lttng_session>;
+       using const_iterator = iterator_template<const session_list, const lttng_session>;
+
 public:
        session_list() : _sessions_count(0), _sessions(nullptr)
        {
@@ -117,6 +121,16 @@ public:
                return iterator(*this, _sessions_count);
        }
 
+       const_iterator begin() const noexcept
+       {
+               return const_iterator(*this, 0);
+       }
+
+       const_iterator end() const noexcept
+       {
+               return const_iterator(*this, _sessions_count);
+       }
+
        std::size_t size() const noexcept
        {
                return _sessions_count;