You can define an union having constructors but a member of class type having constructor is not allowed in union. The reason is obvious: how would the compiler know which destructor to invoke when an object of the union goes out of scope? (for that matter, compiler does not even know which constructor to invoke at the time of creation of an object of such union)
Last year I reviewed the pre-print manuscript of Manning's Functional Programming in C++ written by Ivan Čukić. I really enjoyed reading the book. I enthusiastically support that the book Offers precise, easy-to-understand, and engaging explanations of functional concepts. Who is this book for This book expects a reasonable working knowledge of C++, its modern syntax, and semantics from the readers. Therefore, reading this book might require a companion book for C++ beginners. I think that’s fair because FP is an advanced topic. C++ is getting more and more powerful day by day. While there are many FP topics that could be discussed in such a book, I like the practicality of the topics selected in this book. Here's the table of contents at a glance. This is a solid coverage of functional programming concepts to get a determined programmer going from zero-to-sixty in a matter of weeks. Others have shared their thoughts on this book as well. See Rangarajan Krishnamo...
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