#82 initializing string_view to the result of temporary will likely result in undefined behavior: std::string s = "Hellooooooooooooooo "; std::string_view sv = s + "World\n"; std::cout << sv; https://twitter.com/kayseesee/status/912558563720970240 … godbolt: https://godbolt.org/z/dsOx-8
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#83 For an object with a non-trivial constructor, referring to any non-static member or base class of the object before the constructor begins execution results in undefined behavior... [class.cdtor]p1 http://eel.is/c++draft/class.cdtor#1 …pic.twitter.com/jCwWLYE5od
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#84 [class.cdtor]p3 http://eel.is/c++draft/class.cdtor#3 …pic.twitter.com/vbtLVffSbJ
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#85 [class.cdtor]p4 http://eel.is/c++draft/class.cdtor#4 …pic.twitter.com/lLXUgz0wdy
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#86 [class.cdtor]p5 http://eel.is/c++draft/class.cdtor#5 …pic.twitter.com/dJXwssbTlV
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#87 [class.cdtor]p6 http://eel.is/c++draft/class.cdtor#6 …pic.twitter.com/3pBTmZfyDh
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#88 Twist on use of indeterminate value causing undefined behavior. Uninitialized static function pointer leads to erased hard drive: https://twitter.com/kwalfridsson/status/904494930638368768 …
#cpluspluspic.twitter.com/cW09aV6qL2
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#89 Twist on infinite loop without side effects being undefined behavior. Disproving Fermat’s Last Theorem : https://blog.regehr.org/archives/140
#programmingpic.twitter.com/feR0Di4HM4
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#90 variable length arrays with negative sizes are undefined behavior: void f(int x) { int arr[x]; } int main() { f(-2); } C11 6.7.6.2p5 https://port70.net/~nsz/c/c11/n1570.html#6.7.6.2p5 … godbolt: https://godbolt.org/z/guvLeM pic.twitter.com/hCutVuVNZL
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#91 unaligned loads are undefined behavior char arr[4] = { 0x0F, 0x0, 0x0, 0x00 }; int x = *reinterpret_cast<int*>(arr); [basic.align]p1 http://eel.is/c++draft/basic.align#1 … Also see: https://twitter.com/shafikyaghmour/status/1016414587812343808 …
#cpluspluspic.twitter.com/XidFjzfL4l
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Also see "A bug story: data alignment on x86" where unaligned access leads to a crash on x86: http://pzemtsov.github.io/2016/11/06/bug-story-alignment-on-x86.html …pic.twitter.com/7lta576QdR
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