| Issue |
100869
|
| Summary |
Local object's destructor executed before function return value evaluation
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
fuhsnn
|
The code use a lambda class member to implement the scope guard pattern. The object "guard"'s destructor (which execute the lambda) should be run after the return value being determined.
godbolt: https://godbolt.org/z/aYzcn5dKK
```
#include <cstdio>
template <typename T>
struct scopeguard {
T lambda;
scopeguard(T&& init) : lambda(init) {};
~scopeguard() { lambda(); }
};
struct S {
int i;
};
S test(void) {
S s {};
scopeguard guard { [&](){ s.i += 7; } };
std::printf("returning %d\n", s.i = 22);
return s;
}
int main()
{
std::printf("returned %d\n", test().i);
return 0;
}
```
GCC and MSVC print:
```
returning 22
returned 22
```
Clang print:
```
returning 22
returned 29
```
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