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CWG2887 [diff.cpp03.expr] Should we list the behavioral change of typeid in C++11 due to N3055? #6861

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frederick-vs-ja opened this issue Mar 19, 2024 · 2 comments
Open

CWG2887 [diff.cpp03.expr] Should we list the behavioral change of typeid in C++11 due to N3055? #6861

frederick-vs-ja opened this issue Mar 19, 2024 · 2 comments

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@frederick-vs-ja
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In the following example, the operand of typeid (an xvalue of a polymorphic class type) wasn't evaluated in C++98, but was made to evaluated since C++11 due to N3055.

#include <typeinfo>
#include <cstdio>

struct B {
  virtual ~B() { std::puts("~B"); }
};

struct D : B {};

struct WrapB {
  B b;
};

struct WrapD {
  D d;
};

int main() {
  typeid(true ? WrapB().b : WrapD().d);
}
@t3nsor
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t3nsor commented Mar 25, 2024

Issues like this need to be submitted to CWG so that we can review the example

@frederick-vs-ja frederick-vs-ja mentioned this issue Apr 18, 2024
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@frederick-vs-ja
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frederick-vs-ja commented Apr 18, 2024 •
edited

@t3nsor Submitted an issue in the CWG repo. CWG2887

@frederick-vs-ja frederick-vs-ja changed the title [diff.cpp03.expr] Should we list the behavioral change of typeid in C++11 due to N3055? CWG2887 [diff.cpp03.expr] Should we list the behavioral change of typeid in C++11 due to N3055? Apr 29, 2024
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@t3nsor @frederick-vs-ja