[LLVMbugs] [Bug 21372] New: -Woverloaded-shift-op-parentheses warning text reverses precedence
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Fri Oct 24 07:12:08 PDT 2014
http://llvm.org/bugs/show_bug.cgi?id=21372
Bug ID: 21372
Summary: -Woverloaded-shift-op-parentheses warning text
reverses precedence
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangbugs at nondot.org
Reporter: mitza at ociweb.com
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
Version is 3.5.0 but Bugzilla doesn't let me select it.
-Woverloaded-shift-op-parentheses tells me:
warning: overloaded operator >> has lower precedence than comparison operator
No, it has higher precedence. See
http://en.cppreference.com/w/cpp/language/operator_precedence and Matt's
comments from
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20130506/079687.html
This warning is biased to std::iostreams usage
stream << something == other
really does deserve a warning. The particular code I'm looking at is not
std::istream and its operator>> returns a result code, not a stream&.
if (custom_stream >> variable == 0)
This doesn't need extra parens and doesn't deserve a warning. In general, the
iostreams misuse can be constrained to operator<< since operator>> takes an
rvalue (or manipulator) so probably won't be a comparison expression.
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