NAME

       ZT_NULL, zt_null — construct a claim that a pointer is NULL

SYNOPSIS

       #include <zt.h>

       #define ZT_NULL(value) \
         zt_null( \
           ZT_CURRENT_LOCATION(), \
           zt_pack_pointer((value), #value))

       zt_claim
       zt_null(zt_location location, zt_value value);

DESCRIPTION

       zt_null() constructs a claim that a given pointer is NULL. It should be used through the macro ZT_NULL(),
       which passes source code location and packs argument.

       ZT_NULL() can be useful, when coupled with zt_assert(), to ensure that something that the reminder of the
       test relies on did not happen, for example that no error had occurred.

IMPLEMENTATION NOTES

       ZT_NULL() evaluates value only once.

RETURN VALUES

       Both  the  macro  and  the  function return a zt_claim structure with the appropriate attributes set. The
       returned claim is usually passed to zt_check() or to zt_assert().

SEE ALSO

       zt_assert(3), zt_check(3), zt_claim(3), ZT_CMP_BOOL(3),  ZT_CMP_RUNE(3),  ZT_CMP_CSTR(3),  ZT_CMP_INT(3),
       ZT_CMP_PTR(3), ZT_CMP_UINT(3), ZT_FALSE(3), ZT_NOT_NULL(3), ZT_NULL(3) zt_value(3),

HISTORY

       The ZT_NULL() macro and the zt_null() function first appeared in libzt 0.1

AUTHORS

       Zygmunt Krynicki <me@zygoon.pl>

libzt 0.3.1                                     January 12, 2020                                      ZT_NULL(3)