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Re: [Mingw-users] MinGW Question on versions and Class Constructors




Hi Keith!

On Wed, Mar 23, 2016 at 9:50 AM, Keith Marshall
<keithmarshall@xxxxxxxxxxxxxxxxxxxxx> wrote:
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> On 22/03/16 23:04, Clayton Weaver wrote:
>> I'm using MInGW 4.8.1 which gives me issues with class
>> constructors. For example,
>>
>> class Punct_stream{ public: Punct_stream(istream& is) : source{is},
>> sensitive{true} {} //... private: istream& source; // character
>> source bool sensitive; // is the stream case-sensitive? };
>>
>> The compiler fails with:
>>
>> error: invalid initialization of non-const reference of type
>> 'std::istream& {aka std::basic_istream<char>&}' from an rvalue of
>> type '<brace-enclosed initializer list>'
>
> FWIW, I see exactly the same when I compile with the native GCC-4.8.2,
> on my LinuxMint Debian system, so this isn't MinGW specific; (I also
> see the same with mingw32-g++ v4.8.2, on the same host).
>
>> My main question is does this compile correctly in 4.9.3
>
> Again on the LinuxMint host, the mingw32-g++ v4.9.3 cross-compiler,
> which I used to build the GCC-4.9.3 now offered by MinGW.org, compiles
> it correctly with -std=gnu++11, but not with -std=c++11; the GCC-5.3.0
> cross-compiler, on which I am now working, compiles it correctly with
> either option.

I should have mentioned that with my 4.9.2 mingw-w64 test, I compiled
successfully with "-std=c++11" (as well as with -std=gnu++11, -std=c++14,
and -std=gnu++14).  (As expected, without the -std flag, the compile failed,
because initializer lists are new to c++11.)

It's a little odd that Keith's 4.9.3 needed "-std=gnu++11" to compile Clayton's
code, but my 4.9.2 worked with "-std=c++11".  But, no matter ...

> ...
> Regards,
> Keith.


Best.


K. Frank

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