[Insight-developers] C++11 make_pair() isn't compatible with the uses of 'make_pair<const std::string, std::string>(tag, value)'

[nmgzjf at gmail.com]

Hi,

 

You are right, "make_pair()' has changed in C++ 11 version. The following is the explanation of Stephan T. Lavavej of Visual C++ Libraries Developer. 


C++03: template <class T1, class T2> pair<T1, T2> make_pair(T1 x, T2 y);

C++11: template <class T1, class T2> pair<V1, V2> make_pair(T1&& x, T2&& y);

There are several subtleties in both the C++03 and C++11 versions (C++03 taking values - changed from C++98 - and C++11 returning decayed types). As I recall, VC10 had four overloads, which may or may not have corresponded to a Working Paper at some point in time, but the final version of C++11 specifies the single function template above, and that's what we've implemented in VC11. It's Saturday, so I hope you won't mind if I skip directly to the high-level summary:

C++11 make_pair() is now a perfect forwarding function. This is a good thing (it's more efficient), but it's also incompatible with most uses of explicit template arguments. As it turns out, that's fine because make_pair()'s whole purpose in life is to be used WITHOUT explicit template arguments.


He also gives the suggestion of this situation, we can get the detail from the page: http://connect.microsoft.com/VisualStudio/feedback/details/691756/std-make-pair-error-in-vc11


 

Jianfeng Zhao
Inner Mongolia University of Science and Technology
nm_zjf at imust.edu.cn

 


发件人: Hauke Heibel
发送时间: ‎2013‎年‎9‎月‎30‎日, ‎星期一 ‎16‎:‎56
收件人: nmgzjf at gmail.com
抄送: insight-developers at itk.org

 

Hi,



I think the use of std::make_pair in OptionList.cxx is causing the issue. Either directly instantiate a std::pair or apply a static_cast to the parameters of std::make_pair. The helper std::make_pair is intended to be used without explicitly specifying the template parameters; they should be automatically deduced.




Regards,

Hauke
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