https://llvm.org/bugs/show_bug.cgi?id=24131
Bug ID: 24131
Summary: user-defined conversion function allows cast to
reference
Product: clang
Version: 3.6
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Consider the following code, slightly simplified from SO question
(http://stackoverflow.com/q/31428980/2069064):
#include <string>
struct S
{
std::string s;
explicit operator std::string() const { return s; }
};
int main()
{
static_cast<std::string const&>(S{"hi"});
}
According to [over.match.conv], the candidate conversion functions are those
that "yield type T or a type that can be converted to type T via a standard
conversion sequence." But S does not have a conversion function that yields
std::string const& and the conversion from std::string to std::string const& is
not a standard conversion sequence. This code should be rejected (which gcc
does).
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