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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Cannot return non_const reference to contained value for uninitialized optional variable type.","articleBody":"I'm having an issue with the following code:\r\n\r\nFrom boost/optional.hpp - lines 1267-1281 (problem lines marked with ~)\r\n\r\n\u003e  // Returns a reference to the value if this is initialized, otherwise,\r\n    // the behaviour is UNDEFINED\r\n    // No-throw\r\n    reference_const_type get() const { BOOST_ASSERT(this-\u003eis_initialized()) ; return this-\u003eget_impl(); }\r\n~  reference_type       get()       { BOOST_ASSERT(this-\u003eis_initialized()) ; return this-\u003eget_impl(); }\r\n\r\n\u003e  /// Returns a copy of the value if this is initialized, 'v' otherwise\r\n    reference_const_type get_value_or ( reference_const_type v ) const { return this-\u003eis_initialized() ? get() : v ; }\r\n    reference_type       get_value_or ( reference_type       v )       { return this-\u003eis_initialized() ? get() : v ; }\r\n\r\n\u003e  /// Returns a pointer to the value if this is initialized, otherwise,\r\n    // the behaviour is UNDEFINED\r\n    // No-throw\r\n    pointer_const_type operator-\u003e() const { BOOST_ASSERT(this-\u003eis_initialized()) ; return this-\u003eget_ptr_impl() ; }\r\n~  pointer_type       operator-\u003e()       { BOOST_ASSERT(this-\u003eis_initialized()) ; return this-\u003eget_ptr_impl() ; }\r\n\r\nThe code returns non-const reference and pointer.  These used for getting a reference to the contained variable holding the type presumably so it can be modified.  (this is my case).  BUT, the BOOST_ASSERT traps if the variable isn't initialized.  This makes it impossible to modify the contained value.  The is necessary in the context of the serialization library. ","author":{"url":"https://github.com/robertramey","@type":"Person","name":"robertramey"},"datePublished":"2023-09-05T21:12:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/111/optional/issues/111"}