https://llvm.org/bugs/show_bug.cgi?id=23141
Bug ID: 23141
Summary: std::bind const-qualifying bound arguments captured by
value when compiled as C++14
Product: libc++
Version: 3.6
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The following code fails to compile when compiled as C++14:
#include <functional>
#include <type_traits>
struct Fun
{
template<typename T, typename U>
void operator()(T && t, U && u) const
{
static_assert(std::is_same<U, int &>::value, "");
}
};
int main()
{
std::bind(Fun{}, std::placeholders::_1, 42)("hello");
}
The error is:
static_assert(std::is_same<U, int &>::value, "");
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/clang-trunk/bin/../include/c++/v1/__functional_base:415:12: note: in
instantiation of function template specialization
'Fun::operator()<char const (&)[6], const int &>' requested here
return _VSTD::forward<_Fp>(__f)(_VSTD::forward<_Args>(__args)...);
^
/usr/local/clang-trunk/bin/../include/c++/v1/__config:381:15: note: expanded
from macro '_VSTD'
#define _VSTD std::_LIBCPP_NAMESPACE
^
1 error generated.
When compiled as C++11, the code compiles successfully.
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