nng_ctx_id3
Return numeric context identifier
Usage
#include <nng/nng.h> int nng_ctx_id(nng_ctx c);
Overview
The nng_ctx_id() function returns a positive identifier for the context c, if it is valid. Otherwise it returns -1.
Note
A context is considered valid if it was ever opened with nng_ctx_open() function. Contexts that are allocated on the stack or statically should be initialized with the macro NNG_CTX_INITIALIZER to ensure that they cannot be confused with a valid context before they are opened.
Return values
This function returns the positive value for the context identifier, or -1 if the context is invalid.
Errors
None.