http://llvm.org/bugs/show_bug.cgi?id=16542
Bug ID: 16542
Summary: ambiguous __construct_node while using tuple as a key
for a map
Product: libc++
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following code compiles and behaves as expected using g++ as well as
clang++ with libstdc++. But clang++ with libc++ produces errors. Here is the
test code:
#include <map>
#include <tuple>
using namespace std;
int main()
{
map<tuple<int,int>, size_t> m;
m[make_tuple<int,int>(2,3)]=7;
}
The error remained the same under clang versions 3.3 (Revision: 185618) and 3.4
(Revision: 185530). Below, I quote the full error message.
--------------------------------------
In file included from maptest.cc:1:
/home/sandipan/local/llvm/3.3/include/c++/v1/map:1295:29: error: call to member
function '__construct_node' is ambiguous
__node_holder __h = __construct_node(_VSTD::move(__k));
^~~~~~~~~~~~~~~~
maptest.cc:7:6: note: in instantiation of member function
'std::__1::map<std::__1::tuple<int, int>, unsigned long,
std::__1::less<std::__1::tuple<int, int> >,
std::__1::allocator<std::__1::pair<const std::__1::tuple<int, int>,
unsigned long> > >::operator[]' requested here
m[make_tuple<int,int>(2,3)]=7;
^
/home/sandipan/local/llvm/3.3/include/c++/v1/map:994:10: note: candidate
function [with _A0 = std::__1::tuple<int, int>]
__construct_node(_A0&& __a0);
^
/home/sandipan/local/llvm/3.3/include/c++/v1/map:1001:10: note: candidate
function [with _A0 = std::__1::tuple<int, int>]
__construct_node(_A0&& __a0);
^
/home/sandipan/local/llvm/3.3/include/c++/v1/map:1004:23: note: candidate
function template not viable: requires at least 2 arguments, but 1 was provided
__node_holder __construct_node(_A0&& __a0, _A1&& __a1, _Args&&
...__args);
^
/home/sandipan/local/llvm/3.3/include/c++/v1/map:987:19: note: candidate
function not viable: requires 0 arguments, but 1 was provided
__node_holder __construct_node();
^
1 error generated.
--------------------------
I haven't examined the code very carefully, but it seems there are two
declarations as well as definitions of a function with the (effective)
signature:
__node_holder __construct_node(_A0 &&);
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