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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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I tried the following code of C++. However, the outputs of intf">printf and std::b.com/tag/cout">cout are different. Can someone tell me why?
intf">printf
std::b.com/tag/cout">cout
struct Foo { int a; int b; int c; }; int main() { intf">printf("%d\n", &Foo::c); //the output is 8 std::b.com/tag/cout">cout << &Foo::c <<"\n"; //the output is 1 }
printf("%d\n", &Foo::c): this is undefined behavior, as &Foo::c is not an integer, but a pointer to member (but, actually, it is usual that the compiler stores pointer to data member as offset, and as 8 is the offset of Foo::c, 8 is printed).
printf("%d\n", &Foo::c)
&Foo::c
8
Foo::c
std::cout << &Foo::c: this prints the value &Foo::c. As iostream doesn't have a pointer to member printer, it chooses the closest one: it converts it to bool, and prints it as integer. As &Foo::c converted to bool is true, 1 is printed.
std::cout << &Foo::c
bool
true
1
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