[cfe-users] Bug report: Clang 5.0 (SVN r298093) cannot deduct class template arguments of tuple.

Csaba Raduly via cfe-users cfe-users at lists.llvm.org
Thu Mar 30 00:44:58 PDT 2017


Hi,


Deducing template parameters for constructors is a C++17 feature. You
need to pass the -std=c++1z flag to the compiler.

On Thu, Mar 30, 2017 at 3:48 AM, 312988336 at qq.com via cfe-users
<cfe-users at lists.llvm.org> wrote:
> Hi, all,
>
> Below cannot be compiled with clang 5.0 (SVN r298093) on Visual Studio 2017.
>
> #include <tuple>
>
> using namespace std;
>
> int main()
> {
>     tuple t{ 1, 3.14 };
> }
>
> The error message are as follows:
>
> 1>------ Build started: Project: cpptest, Configuration: Debug x64 ------
> 1>main.cpp(19,8): error : no viable constructor or deduction guide for
> deduction of template arguments of 'tuple'
> 1>        tuple t{ 1, 3.14 };
> 1>              ^
> 1>C:\Program Files (x86)\Microsoft Visual
> Studio\2017\Community\VC\Tools\MSVC\14.10.25017\include\utility(88,8):
> note: candidate function template not viable: requires 0 arguments, but 2
> were provided
> 1>        class tuple;
> 1>              ^
> 1>C:\Program Files (x86)\Microsoft Visual
> Studio\2017\Community\VC\Tools\MSVC\14.10.25017\include\utility(88,8):
> note: candidate function template not viable: requires 1 argument, but 2
> were provided
> 1>1 error generated.
> 1>Done building project "cpptest.vcxproj" -- FAILED.
> ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
>
> I have applied for an account for submitting bugs of clang, but no response
> from the administrators. So I have to send mail to this forum.
>
> ________________________________
> 312988336 at qq.com
>
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>



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