Re: how to make a macro stringify and paste a -D defined arg
On Apr 14, 2:25 am, Kalle Olavi Niemitalo <k...@iki.fi> wrote:
gry <georgeryo...@gmail.com> writes:
#define RegisterFactory(clazz) \
clazz clazz##_instance; \
extern "C" Foo::HHFactory *get##clazz() { return &clazz##_insta=
nce; } \
Foo::HHRegistrar clazz##_registrar(#clazz)
which works fine for literal arguments. But when I give it an
argument that was defined on the compile line:
g++ -DFACTORYNAME=MyFactory
it fails.
Define a new macro that takes FACTORYNAME as an argument and
forwards it to your original macro (renamed below):
#define RegisterFactoryNoExpand(clazz) \
clazz clazz##_instance; \
extern "C" Foo::HHFactory *get##clazz() { return &clazz##_instanc=
e; } \
Foo::HHRegistrar clazz##_registrar(#clazz)
#define RegisterFactory(clazz) RegisterFactoryNoExpand(clazz)
#define FACTORYNAME MyFactory
RegisterFactory(FACTORYNAME);
Then, the preprocessor will expand FACTORYNAME.http://c-faq.com/ansi/stri=
ngize.html
That works beautifully. Thanks!
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