https://bugs.llvm.org/show_bug.cgi?id=51753
Bug ID: 51753
Summary: Nested std::bind with a custom placeholder fails to
compile
Product: libc++
Version: 12.0
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
The code
```
#include <functional>
template<int I> struct lambda2_arg
{
};
constexpr lambda2_arg<1> _1{};
namespace std
{
template<int I> struct is_placeholder< lambda2_arg<I> >: integral_constant<int,
I>
{
};
} // namespace std
struct plus_equal
{
template<class T1, class T2> decltype(auto) operator()(T1&& t1, T2&& t2)
const
{
return std::forward<T1>(t1) += std::forward<T2>(t2);
}
};
struct X
{
int m;
};
int main()
{
X x{ 1 };
return std::bind( plus_equal(), std::bind( &X::m, _1 ), 1 )( x );
}
```
(https://godbolt.org/z/8h1Td56c7)
fails to compile. Other standard libraries work. Using std::placeholders::_1
instead of _1 works.
(This bind expression is produced by Boost.Lambda2.)
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