在 2025-5-4 22:24, наб 写道:
Consider the following program, reduced from Lensfun:
#include <cstring>
extern char *f(const char *first_element, ...) __attribute__((__sentinel__));
static auto N = f("a", "b", NULL);
static auto n = f("a", "b", nullptr);
static auto z = f("a", "b", 0);
#define NULL 123
in C++11 and later, NULL=nullptr so N/n are valid, and z is wrong.
In C++ it's common to have `NULL` defined as `0`. Your code should not assume `NULL` is an expression whose size is a pointer.
-- Best regards, LIU Hao
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