C++14 Features Supported by Intel C++ Compiler 15.0

[Boris_R_]

This post claims some C++14 features are supported by Intel C++ 15.0 compiler:

https://software.intel.com/en-us/articles/c14-features-supported-by-intel-c-compiler

However I couldn't get any of them to work using Intel C++ 15.0 on Windows. What gives?

[QIAOMIN_Q_]

Hello Boris,

What's your specific Intel compiler version and Visual studio version? could you provide some test case to illustrate these unsupported features?

Thank you.
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QIAOMIN.Q
Intel Developer Support
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[Boris_R_]

Hi,

Thanks for responding.

Visual Studio 2013 Update 3.

Intel Parallel Studio XE 2015 Composer Edition (2015.0.108)

// Initialized lambda captures: simple-capture, init-capture:

void test()

{
    [a=1]{};
}

This gives an error:

1>cstring.cpp(24): error : expected a declaration
1>        [a=1]{};
1>             ^

// decltype(auto), return type deduction for normal functions:

void test2()
{
    decltype(auto) i = 5;
}

This gives an error:

1>cstring.cpp(24): error : expected a type specifier
1>        decltype(auto) i = 5;
1>        ^

[QIAOMIN_Q_]

Hello Martin,

   I have reproduced as you said and will enter this issue into our problem-tracking database.Thank you for submitting the issue.I'll get this posted whenever I have an update from our development team.

Thank you.
--
QIAOMINQ.
Intel Developer Support

[Boris_R_]

I don't think these are C++11 related bugs.

The two code snippets I provided are using C++14 features.

Which Intel C++ 15.0 lists as supported here: https://software.intel.com/en-us/articles/c14-features-supported-by-intel-c-compiler

Perhaps the bug is that in Intel C++ 15.0 compiler C++14 support is mistakenly disabled (only on Windows)?

[QIAOMIN_Q_]

Hello Boris,

  This is a C++14 unsupported feature of compiler front end. I got a workaround for you.

Assign the lambda to a temporary variable and then call it, i.e.


void test()
{
   auto foo= [a = 1]{};
   foo();
}
 

  Hope that helps for now. I'll get this posted whenever I have an update from our development team.

Thank you.
--
QIAOMINQ.
Intel Developer Support

[Boris_R_]

QIAOMINQ,

The code you provided doesn't compile either.

But I think you are missing the whole point anyway.

Intel documentation here says these C++14 features are supported:

https://software.intel.com/en-us/articles/c14-features-supported-by-intel-c-compiler

Is the documentation wrong, or do I need to specify some flag to enable support for these C++14 features?

Boris.

[Feilong_H_Intel]

Hi Boris,

I was informed that this issue has been addessed in Composer XE 2015 Update 3, which could be downloaded in <https://registrationcenter.intel.com>.  I’m closing this issue now.  Please feel free to reopen it or create a new issue if the problem still persists in Update 3.

Thank you for your issue submission.

[Judith_W_Intel]

Boris,

In order to use the new c++14 features on Linux you need to specify the -std=c++14 switch (just like with GNU can Clang).

Judy

[Gomes_T_]

On windows one will need to use /Qstd:c++14 instate of /Qstd=c++11 . Please note that : is used instate of = .