Sujet : Re: I want to use the g++ template in the "C" gcc software
De : aotto1968 (at) *nospam* t-online.de (aotto1968)
Groupes : comp.lang.cDate : 12. Dec 2024, 16:17:19
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vjeupv$26b6h$1@dont-email.me>
References : 1 2
User-Agent : Mozilla Thunderbird
On 12.12.24 11:24, David Brown wrote:
On 12/12/2024 09:37, aotto1968 wrote:
Hi,
>
I create a C software and there is a requirement to use the g++ template *in* the gcc.
I do *not* want to use all the g++ "boilerplate" like special syntax, classes etc
I just want to use the template.
>
goal:
>
1. I already use "inline" code to replace "cpp-macro-like" syntax in the header.
2. NOW I *want* to replace a "cpp-macro" which use the *data-type* as an argument with a template.
>
question.
>
1. Is there a g++ switch to disable all the g++ features except of C source and template feature ?
2. Is there a gcc switch to add g++-template feature into gcc ?
3. is there an external software to add the c++-template feature into an existing C software ?
>
thanks.
It might help if you give an example of what you are trying to achieve - it doesn't have to be valid code that can be compiled.
gcc has command-line options to disable some features of C and C++, but not like you are describing. And C++ without classes is not the same as C anyway. But you might find you can write your code in C++ and simply not use the features you don't want to use.
If you are trying to make type-generic function-like "things" in C, then you have to use macros. But you can use modern features of C11 and C23 to make this safer and neater than in older C standards. gcc also provides extensions that can help, if you are happy writing gcc-specific code.
You should do your own googling for information, tutorials and examples here, but these links will give you some starting points:
C11 _Generic selections:
<https://en.cppreference.com/w/c/language/generic>
C23 "typeof" and "auto" type inference:
<https://en.cppreference.com/w/c/language/typeof>
<https://en.cppreference.com/w/c/language/auto>
gcc extensions:
<https://gcc.gnu.org/onlinedocs/gcc/Statement-Exprs.html>
<https://gcc.gnu.org/onlinedocs/gcc/Typeof.html>
Thanks for your links but I already know "feature" of gcc etc…
I still want to get better "macro" code use template like c++ has
example: (the 'cls' is a type and the `pBufferInit_T` create a type specific "inline"
-> this I want to replace with an template.
#define pBufferInit_T(pre, cls) \
mk_inline void \
p##cls##Init ( \
MK_RT_ARGS \
pre##cls##C##R * const loc, \
MK_TYP const type, \
MK_NUM const size \
) { \
pppBufferInit(MK_RT_CALL pre##cls##C##_X2buf(loc),size, \
(MK_NUM)((*type).objsize-sizeof(pre##cls##C##R)), \
offsetof(pre##cls##C##R,ils_data)); \
if (type->objsig != (*pre##cls##C##_X2obj(loc)).signature) { \
(*pre##cls##C##_X2obj(loc)) = MkObjInitFromType(type,true /* isLocal */); \
} \
/* ppBufferInit */ \
/* ppBufferStreamInit */ \
pp##cls##Init(MK_RT_CALL loc); \
/* pBufferReset */ \
/* pBufferStreamReset */ \
p##cls##Reset(loc); \
} \