https://llvm.org/bugs/show_bug.cgi?id=25816
Bug ID: 25816
Summary: No Warning when converting an array of a subclass to
its parent
Product: clang
Version: 3.7
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Without bringing up the deadly "warn when using arrays in function
declarations" quagmire, if you are converting an array of one type to that of
another due to pointer decay, there should probably at least be a huge warning.
eg the following prints "1 2" to the surprise of many unthinking programmers.
#include <stdio.h>
class A {
public:
int a;
};
class B : public A {
public:
int b;
};
void go(A b[2]) {
fprintf(stderr, "%d %d\n", b[0].a, b[1].a);
}
int main() {
B bs[2];
bs[0].a = 1;
bs[0].b = 2;
bs[1].a = 3;
bs[1].b = 4;
go(bs);
}
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