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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compound assignment in constexpr function treated as ill-formed if LHS is an int and RHS is a floating point type"
href="https://bugs.llvm.org/show_bug.cgi?id=39858">39858</a>
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<th>Summary</th>
<td>Compound assignment in constexpr function treated as ill-formed if LHS is an int and RHS is a floating point type
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>yaghmour.shafik@gmail.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Given the following example from this Stack Overflow question
<a href="https://stackoverflow.com/q/53570652/1708801">https://stackoverflow.com/q/53570652/1708801</a>
template<class A, class B> constexpr int f(A a, B b) {
a /= b;
return a;
}
constexpr int x = f(2, 2); // a, b: int
constexpr int y = f(2., 2.); // a, b: double
constexpr int z = f(2, 2.); // a: int, b: double //<-- BOOM!
constexpr int w = f(2., 2); // a: double, b: int
int main() {}
The line initialization of z is treated as ill-formed but there is nothing in
[dcl.constexpr]p3 or [expr.const] that would seem to make this case different
than the rest, so this looks like a bug.</pre>
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