[GiNaC-devel] [SCM] GiNaC -- a C++ library for symbolic computations branch, master, updated. release_1-4-0-734-gb98ef824

[Richard B. Kreckel]

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- Log -----------------------------------------------------------------
commit b98ef824450d2897f5ea8f5254d614e6f8148d33
Author: Jan Rheinländer <jrheinlaender at gmx.de>
Date:   Wed Feb 16 23:57:36 2022 +0100

    Work around a compiler bug on MSVC.
    
    The two 'reg_info' declarations introduced in f271f67d2f turned out
    to confuse MSVC: It thinks that these declarations are definitions
    and then complains about a missing default ctor (error C2512) and
    about duplicate definitions later in the .cpp files (error C2766).
    
    But the standard says in [temp.expl.spec] §13:
    An explicit specialization of a static data member of a template or
    an explicit specialization of a static  data member template is a
    definition if the declaration includes an initializer; otherwise, it
    is a declaration. [Note: The definition of a static data member of a
    template that requires default-initialization must use a braced-init-
    list:
        template<> X Q<int>::x;     // declaration
        template<> X Q<int>::x ();  // error: declares a function
        template<> X Q<int>::x { }; // definition
    --end note]
    There is no initializer at lst.h:35 and at exprseq.h:35. Hence, this
    is merely a declaration and the compiler's error message is wrong.
    Let's work around by #ifndef'ing the two lines for silly MSVC.

-----------------------------------------------------------------------

Summary of changes:
 ginac/exprseq.h | 2 ++
 ginac/lst.h     | 2 ++
 2 files changed, 4 insertions(+)


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GiNaC -- a C++ library for symbolic computations