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>