Question

What is virtual constructors/destructors?

Answer 1

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• Virtual destructors: If an object (with a non-virtual destructor) is destroyed explicitly by applying the delete operator to a base-class pointer to the object, the base-class destructor function (matching the pointer type) is called on the object.

Answer 2

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• ᴠɪʀᴛᴜᴀʟ ᴅᴇsᴛʀᴜᴄᴛᴏʀs: ɪғ ᴀɴ ᴏʙᴊᴇᴄᴛ (ᴡɪᴛʜ ᴀ ɴᴏɴ-ᴠɪʀᴛᴜᴀʟ ᴅᴇsᴛʀᴜᴄᴛᴏʀ) ɪs ᴅᴇsᴛʀᴏʏᴇᴅ ᴇxᴘʟɪᴄɪᴛʟʏ ʙʏ ᴀᴘᴘʟʏɪɴɢ ᴛʜᴇ ᴅᴇʟᴇᴛᴇ ᴏᴘᴇʀᴀᴛᴏʀ ᴛᴏ ᴀ ʙᴀsᴇ-ᴄʟᴀss ᴘᴏɪɴᴛᴇʀ ᴛᴏ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ, ᴛʜᴇ ʙᴀsᴇ-ᴄʟᴀss ᴅᴇsᴛʀᴜᴄᴛᴏʀ ғᴜɴᴄᴛɪᴏɴ (ᴍᴀᴛᴄʜɪɴɢ ᴛʜᴇ ᴘᴏɪɴᴛᴇʀ ᴛʏᴘᴇ) ɪs ᴄᴀʟʟᴇᴅ ᴏɴ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ.