include/bluetooth: rearrange for standard use of extern "C"

Consistently place C++ use of extern "C" after all include directives,
within the negative branch of _ASMLANGUAGE if used.

Background from issue #17997:

Declarations that use C linkage should be placed within extern "C"
so the language linkage is correct when the header is included by
a C++ compiler.

Similarly #include directives should be outside the extern "C" to
ensure the language-specific default linkage is applied to any
declarations provided by the included header.

See: https://en.cppreference.com/w/cpp/language/language_linkage
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2019-08-12 12:54:12 -05:00 committed by Carles Cufí
commit 5412409781
9 changed files with 26 additions and 27 deletions

View file

@ -18,12 +18,12 @@
* as a part of ongoing development.
*/
#include <zephyr/types.h>
#ifdef __cplusplus
extern "C" {
#endif
#include <zephyr/types.h>
/** @brief Read battery level value.
*
* Read the characteristic value of the battery level