On Sun, Feb 10, 2013 at 1:38 AM, john skaller
<skal...@users.sourceforge.net> wrote:
> Grrr .. why is C++ syntax so completely bad that most compilers
> cannot get it right??? Stupid committee trying to avoid extra keywords...
>
> This works with gcc 4.2.1 and with clang 3.3:
>
>
> ((::std::string*)(&tmp))->::std::basic_string<char>::~basic_string<char>();
>
> but not with:
>
> g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
>
> Instead I get this:
>
> /home/skaller/.felix/cache/text/home/skaller/felix/build/release/tools/flx_grep.cpp:
> In function ‘size_t RE2_decoder(void*, char*, size_t)’:
> /home/skaller/.felix/cache/text/home/skaller/felix/build/release/tools/flx_grep.cpp:24:77:
> error: expected class-name before ‘(’ token
>
> The funny thing is that the template:
>
> template<class T> void destroy (T *p) { p->~U; }
>
> usage:
>
> destroy<string>();
>
> always works. Isn't there a standard template for that?
> Anyone know what the proper C++ syntax is?
I think it's a gcc 4.6.3 bug that it doesn't accept your original
code, but that's overcomplicated code anyway. It compiles cleanly
with
gcc version 4.8.0 20121026 (experimental) (GCC), my 4 month-old gcc build.
The template version has clues to simple syntax that's more portable
to older/buggier compilers -- drop the qualification, the lookup is
already in the scope of p's type, and you don't need to write out
basic_string<char> when you already have a handy typedef either, the
->~Typename
Here are some options that work with gcc 4.6.3 and clang 3.0 at least:
((::std::string*)(&tmp))->std::basic_string<char>::~basic_string();
((::std::string*)(&tmp))->~basic_string<char>();
((::std::string*)(&tmp))->~basic_string();
Qualification is unnecessary as the lookup starts in ::std::string,
and the injected class name is implicitly basic_string<char>.
-- James
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