config/macros.hpp File Reference

#include <ecl/config/ecl.hpp>

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Macros
#define	ECL_CXX11_NOT_FOUND
	C++11 support is available. More...
#define	ECL_DEPRECATED
	Deprecated compiler warnings. More...
#define	ECL_DONT_INLINE
	Prevents a function from being inlined. More...
#define	ECL_HELPER_EXPORT
	Declare public visibility for libraries. More...
#define	ECL_HELPER_IMPORT
#define	ECL_HELPER_LOCAL
#define	ECL_LOCAL
#define	ECL_PUBLIC

Macro Definition Documentation

#define ECL_HELPER_EXPORT

Declare public visibility for libraries.

This emits (in a cross platform way) the required symbols for setting whether a function/class should be visible or hidden. Note only does this protect the private parts of your library, but it can also greatly speed up the linking process.

• http://gcc.gnu.org/wiki/Visibility

To check what symbols are being exported for a gnu library,

nm -C -D <library>.so

Usage:

Each package needs to create it's own macro to make use of the macro that cmake defines for library targets:

#ifdef ROS_BUILD_SHARED_LIBS // ros is being built around shared libraries
  #ifdef ecl_common_EXPORTS // we are building a shared lib/dll
    #define ecl_common_PUBLIC ROS_HELPER_EXPORT
  #else // we are using shared lib/dll
    #define ecl_common_PUBLIC ROS_HELPER_IMPORT
  #endif
#else // ros is being built around static libraries
  #define ecl_common_DECL
#endif

And use it alongside class or function definitions:

extern "C" ecl_common_PUBLIC void function(int a);
class ecl_common_PUBLIC SomeClass {
    int c;
    ecl_common_LOCAL void privateMethod();  // Only for use within this DSO
public:
    Person(int _c) : c(_c) { }
    static void foo(int a);
};

See also

ECL_HELPER_IMPORT, ECL_HELPER_LOCAL

Definition at line 163 of file config/macros.hpp.

#define ECL_HELPER_IMPORT

See also

ECL_HELPER_EXPORT, ECL_HELPER_LOCAL

Definition at line 162 of file config/macros.hpp.

#define ECL_HELPER_LOCAL

See also

ECL_HELPER_EXPORT, ECL_HELPER_IMPORT

Definition at line 164 of file config/macros.hpp.

#define ECL_LOCAL

Definition at line 170 of file config/macros.hpp.

#define ECL_PUBLIC

Definition at line 169 of file config/macros.hpp.