http://llvm.org/bugs/show_bug.cgi?id=18731
Bug ID: 18731
Summary: lifetime-extension of conditional temporaries isn't
quite right
Product: clang
Version: trunk
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
(See core issue 1299 for the full rules.)
Consider:
bool b;
struct S { S(int); ~S(); };
struct T { S s = 0; };
S &&r = b ? static_cast<S&&>(T().s) : static_cast<S&&>(S(2));
Here, we should lifetime-extend the T object or the S object, depending on
which arm of the conditional is selected. Currently, we lifetime-extend
neither.
While we're here, we fail to lifetime extend in this case:
using T = int[3];
//int &&r = T{}[0];
int &r = T{}[0];
... but we should. (We also reject the commented code because we classify the
array indexing as an lvalue rather than an xvalue; that's a different DR.)
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