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| /* C++ compatible function declaration macros. | ||
| Copyright (C) 2010 Free Software Foundation, Inc. | ||
| This program is free software: you can redistribute it and/or modify it | ||
| under the terms of the GNU General Public License as published | ||
| by the Free Software Foundation; either version 3 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| Lesser General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ | ||
|
|
||
| #ifndef _GL_CXXDEFS_H | ||
| #define _GL_CXXDEFS_H | ||
|
|
||
| /* The three most frequent use cases of these macros are: | ||
| * For providing a substitute for a function that is missing on some | ||
| platforms, but is declared and works fine on the platforms on which | ||
| it exists: | ||
| #if @GNULIB_FOO@ | ||
| # if !@HAVE_FOO@ | ||
| _GL_FUNCDECL_SYS (foo, ...); | ||
| # endif | ||
| _GL_CXXALIAS_SYS (foo, ...); | ||
| _GL_CXXALIASWARN (foo); | ||
| #elif defined GNULIB_POSIXCHECK | ||
| ... | ||
| #endif | ||
| * For providing a replacement for a function that exists on all platforms, | ||
| but is broken/insufficient and needs to be replaced on some platforms: | ||
| #if @GNULIB_FOO@ | ||
| # if @REPLACE_FOO@ | ||
| # if !(defined __cplusplus && defined GNULIB_NAMESPACE) | ||
| # undef foo | ||
| # define foo rpl_foo | ||
| # endif | ||
| _GL_FUNCDECL_RPL (foo, ...); | ||
| _GL_CXXALIAS_RPL (foo, ...); | ||
| # else | ||
| _GL_CXXALIAS_SYS (foo, ...); | ||
| # endif | ||
| _GL_CXXALIASWARN (foo); | ||
| #elif defined GNULIB_POSIXCHECK | ||
| ... | ||
| #endif | ||
| * For providing a replacement for a function that exists on some platforms | ||
| but is broken/insufficient and needs to be replaced on some of them and | ||
| is additionally either missing or undeclared on some other platforms: | ||
| #if @GNULIB_FOO@ | ||
| # if @REPLACE_FOO@ | ||
| # if !(defined __cplusplus && defined GNULIB_NAMESPACE) | ||
| # undef foo | ||
| # define foo rpl_foo | ||
| # endif | ||
| _GL_FUNCDECL_RPL (foo, ...); | ||
| _GL_CXXALIAS_RPL (foo, ...); | ||
| # else | ||
| # if !@HAVE_FOO@ or if !@HAVE_DECL_FOO@ | ||
| _GL_FUNCDECL_SYS (foo, ...); | ||
| # endif | ||
| _GL_CXXALIAS_SYS (foo, ...); | ||
| # endif | ||
| _GL_CXXALIASWARN (foo); | ||
| #elif defined GNULIB_POSIXCHECK | ||
| ... | ||
| #endif | ||
| */ | ||
|
|
||
| /* _GL_EXTERN_C declaration; | ||
| performs the declaration with C linkage. */ | ||
| #if defined __cplusplus | ||
| # define _GL_EXTERN_C extern "C" | ||
| #else | ||
| # define _GL_EXTERN_C extern | ||
| #endif | ||
|
|
||
| /* _GL_FUNCDECL_RPL (func, rettype, parameters_and_attributes); | ||
| declares a replacement function, named rpl_func, with the given prototype, | ||
| consisting of return type, parameters, and attributes. | ||
| Example: | ||
| _GL_FUNCDECL_RPL (open, int, (const char *filename, int flags, ...) | ||
| _GL_ARG_NONNULL ((1))); | ||
| */ | ||
| #define _GL_FUNCDECL_RPL(func,rettype,parameters_and_attributes) \ | ||
| _GL_FUNCDECL_RPL_1 (rpl_##func, rettype, parameters_and_attributes) | ||
| #define _GL_FUNCDECL_RPL_1(rpl_func,rettype,parameters_and_attributes) \ | ||
| _GL_EXTERN_C rettype rpl_func parameters_and_attributes | ||
|
|
||
| /* _GL_FUNCDECL_SYS (func, rettype, parameters_and_attributes); | ||
| declares the system function, named func, with the given prototype, | ||
| consisting of return type, parameters, and attributes. | ||
| Example: | ||
| _GL_FUNCDECL_SYS (open, int, (const char *filename, int flags, ...) | ||
| _GL_ARG_NONNULL ((1))); | ||
| */ | ||
| #define _GL_FUNCDECL_SYS(func,rettype,parameters_and_attributes) \ | ||
| _GL_EXTERN_C rettype func parameters_and_attributes | ||
|
|
||
| /* _GL_CXXALIAS_RPL (func, rettype, parameters); | ||
| declares a C++ alias called GNULIB_NAMESPACE::func | ||
| that redirects to rpl_func, if GNULIB_NAMESPACE is defined. | ||
| Example: | ||
| _GL_CXXALIAS_RPL (open, int, (const char *filename, int flags, ...)); | ||
| */ | ||
| #define _GL_CXXALIAS_RPL(func,rettype,parameters) \ | ||
| _GL_CXXALIAS_RPL_1 (func, rpl_##func, rettype, parameters) | ||
| #if defined __cplusplus && defined GNULIB_NAMESPACE | ||
| # define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \ | ||
| namespace GNULIB_NAMESPACE \ | ||
| { \ | ||
| rettype (*const func) parameters = ::rpl_func; \ | ||
| } \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #else | ||
| # define _GL_CXXALIAS_RPL_1(func,rpl_func,rettype,parameters) \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #endif | ||
|
|
||
| /* _GL_CXXALIAS_SYS (func, rettype, parameters); | ||
| declares a C++ alias called GNULIB_NAMESPACE::func | ||
| that redirects to the system provided function func, if GNULIB_NAMESPACE | ||
| is defined. | ||
| Example: | ||
| _GL_CXXALIAS_SYS (open, int, (const char *filename, int flags, ...)); | ||
| */ | ||
| #if defined __cplusplus && defined GNULIB_NAMESPACE | ||
| /* If we were to write | ||
| rettype (*const func) parameters = ::func; | ||
| like above in _GL_CXXALIAS_RPL_1, the compiler could optimize calls | ||
| better (remove an indirection through a 'static' pointer variable), | ||
| but then the _GL_CXXALIASWARN macro below would cause a warning not only | ||
| for uses of ::func but also for uses of GNULIB_NAMESPACE::func. */ | ||
| # define _GL_CXXALIAS_SYS(func,rettype,parameters) \ | ||
| namespace GNULIB_NAMESPACE \ | ||
| { \ | ||
| static rettype (*func) parameters = ::func; \ | ||
| } \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #else | ||
| # define _GL_CXXALIAS_SYS(func,rettype,parameters) \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #endif | ||
|
|
||
| /* _GL_CXXALIAS_SYS_CAST (func, rettype, parameters); | ||
| is like _GL_CXXALIAS_SYS (func, rettype, parameters); | ||
| except that the C function func may have a slightly different declaration. | ||
| A cast is used to silence the "invalid conversion" error that would | ||
| otherwise occur. */ | ||
| #if defined __cplusplus && defined GNULIB_NAMESPACE | ||
| # define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \ | ||
| namespace GNULIB_NAMESPACE \ | ||
| { \ | ||
| static rettype (*func) parameters = \ | ||
| reinterpret_cast<rettype(*)parameters>(::func); \ | ||
| } \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #else | ||
| # define _GL_CXXALIAS_SYS_CAST(func,rettype,parameters) \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #endif | ||
|
|
||
| /* _GL_CXXALIAS_SYS_CAST2 (func, rettype, parameters, rettype2, parameters2); | ||
| is like _GL_CXXALIAS_SYS (func, rettype, parameters); | ||
| except that the C function is picked among a set of overloaded functions, | ||
| namely the one with rettype2 and parameters2. Two consecutive casts | ||
| are used to silence the "cannot find a match" and "invalid conversion" | ||
| errors that would otherwise occur. */ | ||
| #if defined __cplusplus && defined GNULIB_NAMESPACE | ||
| /* The outer cast must be a reinterpret_cast. | ||
| The inner cast: When the function is defined as a set of overloaded | ||
| functions, it works as a static_cast<>, choosing the designated variant. | ||
| When the function is defined as a single variant, it works as a | ||
| reinterpret_cast<>. The parenthesized cast syntax works both ways. */ | ||
| # define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \ | ||
| namespace GNULIB_NAMESPACE \ | ||
| { \ | ||
| static rettype (*func) parameters = \ | ||
| reinterpret_cast<rettype(*)parameters>( \ | ||
| (rettype2(*)parameters2)(::func)); \ | ||
| } \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #else | ||
| # define _GL_CXXALIAS_SYS_CAST2(func,rettype,parameters,rettype2,parameters2) \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #endif | ||
|
|
||
| /* _GL_CXXALIASWARN (func); | ||
| causes a warning to be emitted when ::func is used but not when | ||
| GNULIB_NAMESPACE::func is used. func must be defined without overloaded | ||
| variants. */ | ||
| #if defined __cplusplus && defined GNULIB_NAMESPACE | ||
| # define _GL_CXXALIASWARN(func) \ | ||
| _GL_CXXALIASWARN_1 (func, GNULIB_NAMESPACE) | ||
| # define _GL_CXXALIASWARN_1(func,namespace) \ | ||
| _GL_CXXALIASWARN_2 (func, namespace) | ||
| # define _GL_CXXALIASWARN_2(func,namespace) \ | ||
| _GL_WARN_ON_USE (func, \ | ||
| "The symbol ::" #func " refers to the system function. " \ | ||
| "Use " #namespace "::" #func " instead.") | ||
| #else | ||
| # define _GL_CXXALIASWARN(func) \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #endif | ||
|
|
||
| /* _GL_CXXALIASWARN1 (func, rettype, parameters_and_attributes); | ||
| causes a warning to be emitted when the given overloaded variant of ::func | ||
| is used but not when GNULIB_NAMESPACE::func is used. */ | ||
| #if defined __cplusplus && defined GNULIB_NAMESPACE | ||
| # define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \ | ||
| _GL_CXXALIASWARN1_1 (func, rettype, parameters_and_attributes, \ | ||
| GNULIB_NAMESPACE) | ||
| # define _GL_CXXALIASWARN1_1(func,rettype,parameters_and_attributes,namespace) \ | ||
| _GL_CXXALIASWARN1_2 (func, rettype, parameters_and_attributes, namespace) | ||
| # define _GL_CXXALIASWARN1_2(func,rettype,parameters_and_attributes,namespace) \ | ||
| _GL_WARN_ON_USE_CXX (func, rettype, parameters_and_attributes, \ | ||
| "The symbol ::" #func " refers to the system function. " \ | ||
| "Use " #namespace "::" #func " instead.") | ||
| #else | ||
| # define _GL_CXXALIASWARN1(func,rettype,parameters_and_attributes) \ | ||
| _GL_EXTERN_C int _gl_cxxalias_dummy | ||
| #endif | ||
|
|
||
| #endif /* _GL_CXXDEFS_H */ |
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