[LLVMbugs] [Bug 6945] New: Failed template argument deduction should mention argument types

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6945

           Summary: Failed template argument deduction should mention
                    argument types
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Keywords: quality-of-implementation
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: jyasskin at google.com
                CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com


And, ideally, say which ones failed to match the parameters.

As of r102340, std::max(different, types) produces an error message that
doesn't help the user figure out what they did wrong.


$ cat test.cc
#include <algorithm>

long foo(int arg1, long arg2) {
    return std::max(arg1, arg2);
}

$ clang -c test.cc
test.cc:4:12: error: no matching function for call to 'max'
    return std::max(arg1, arg2);
           ^~~~~~~~
In file included from test.cc:1:
In file included from /usr/include/c++/4.0.0/algorithm:64:
/usr/include/c++/4.0.0/bits/stl_algobase.h:206:5: note: candidate template
ignored: failed template argument deduction
    max(const _Tp& __a, const _Tp& __b)
    ^
/usr/include/c++/4.0.0/bits/stl_algobase.h:248:5: note: candidate template
ignored: failed template argument deduction
    max(const _Tp& __a, const _Tp& __b, _Compare __comp)
    ^
1 error generated.

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