SYNOPSIS
#include <nng/nng.h>
int nng_ctx_id(nng_ctx c);DESCRIPTION
The nng_ctx_id() function returns a positive identifier for the context c,
if it is valid.
Otherwise it returns -1.
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.
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RETURN VALUES
This function returns the positive value for the context identifier, or
-1 if the context is invalid.
ERRORS
None.