https://bugs.llvm.org/show_bug.cgi?id=39911
Bug ID: 39911
Summary: Lambda call operator invoked if streamed to std::cout
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
Consider the following code:
int main()
{
auto lam = [](auto x) {return x*2;};
std::cout << lam; // fails with: "error: invalid operands to binary
expression ('std::basic_ostream<char>' and 'int')"
}
If a lambda is passed to std::cout compilation does not fail as expected. It
fails but for the wrong reason ("invalid operands to binary expression, rather
than "no matching function call"). It seems that the call operator is
instantiated (and called with iostream as input) somewhere in the overload
resolution. I think that this is not correct. The problem in my use case is,
that this breaks expression sfinae.
See the more comprehensive example here: https://godbolt.org/z/-6fz0o
The code works as expected with gcc and msvc, so I guess it's a clang problem.
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