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[Testing/Support] Remove the const_cast in TakeExpected

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Summary:
The const_cast in the "const" version of TakeExpected was quite
dangerous, as the function does indeed modify the apparently const
argument.

I assume the reason the const overload was added was to make the
function bind to xvalues(temporaries). That can be also achieved with
rvalue references, so I use that instead.

Using the ASSERT macros on const Expected objects will now become
illegal, but I believe that is correct, as it is not actually possible
to inspect the error stored in an Expected object without modifying it.

Reviewers: zturner, chandlerc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D34405

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306001 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pavel Labath 2017-06-22 13:11:50 +00:00
parent 7cbb839d2b
commit 841b888a68
1 changed files with 2 additions and 2 deletions
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4
include/llvm/Testing/Support/Error.h
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@ -30,8 +30,8 @@ template <typename T> ExpectedHolder<T> TakeExpected(Expected<T> &Exp) {
return Result;
}
template <typename T> ExpectedHolder<T> TakeExpected(const Expected<T> &Exp) {
return TakeExpected(const_cast<Expected<T> &>(Exp));
template <typename T> ExpectedHolder<T> TakeExpected(Expected<T> &&Exp) {
return TakeExpected(Exp);
}
} // namespace detail