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In my previous question (Why value captured by reference in lambda is broken?) answer is "because you access memory of variable that is out of scope".
In most common compilers (I mean Visual C++, gcc and clang) is there compiler warnings about this incorrect memory access?
Generally? No. It's intractible to do so. They can't.
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Can clang-tidy break the code (when you apply the -fix option)?
For example, it can reorder headers and cause some wrong order of included symbols.
But maybe you have more examples where it can break?
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To be honest (*this) looks a lot better than this->. They both function the same. Why shouldn't I use the former? Is it just common practice to use this->, or is there something more to it?
Actually both will have same results when accessing data-members. Though you find (*this) more elegant I would undoubtedly say most will disagree.
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What changes does it happen in the program when the exception is caught? How does thrown exception is caught in nearest catch block.
Well, I tried implementing simple exception-handling in C 2 years ago. Let me show it to you.
https://github.com/dlarudgus20/CTryCatch
(In fact, I made the github repository to practice as soon as I saw you question - it's my first repository >o< Thank you to give me the opportunity to use github!)
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Is there is any specific reason behind undefined behavior in C and C++?
Why are some features left undefined?
For some part at least, it was to allow a more efficient implementation.
A simple example: Function parameters. Their evaluation order in unspecifed, because some architectures could work better depending on how they made the calculations or the calling convention (registers, stack, etc.)
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I am wondering if -Dfoobar the standard way for adding definition to the compiler for all the C++ compiler.
-Dfoobar works for all the compilers that have ever been used to compile Firefox, which is good enough for me. The Microsoft compilers also accept /Dfoobar, of course.