multiplying 2 size_t variables results in a size_t, not a function pointer.
curl_write_callback declares a pointer to the callback function. Your function (as in the example) needs to be the actual function - I assumed that was obvious. Sorry that I wasn't explicit.
So your callback wants to be a
typedef size_t (curl_write_callback_action)(char *buffer,
size_t size,
size_t nitems,
void *outstream);
note the omitted "*" vs. the original.
Perhaps curl.h should include typedefs for the callback actions as well
as for the pointers...
Timothe Litt ACM Distinguished Engineer -------------------------- This communication may not represent the ACM or my employer's views, if any, on the matters discussed. On 21-Jan-22 06:13, Gavin Henry via curl-library wrote:
It enables link-time optimizations. The compiler/linker can see further into to the source, and detect errors not seen at the module level. It's saying that your callback routine must be declared/typedefed as a "curl_write_callback".Thanks Tim. Which is actually: https://curl.se/libcurl/c/getinmemory.html as per curl.h and is the same as the example code: https://curl.se/libcurl/c/getinmemory.html so if I switch to: static curl_write_callback curl_to_jansson_to_version(void *buffer, size_t size, size_t nmemb, json_t *json) { I get: Incompatible integer to pointer conversion returning 'unsigned long' from a function with result type 'curl_write_callback' (aka 'unsigned long (*)(char *, unsigned long, unsigned long, void *)') error: returning ‘size_t’ {aka ‘long unsigned int’} from a function with return type ‘curl_write_callback’ {aka ‘long unsigned int (*)(char *, long unsigned int, long unsigned int, void *)’} makes pointer from integer without a cast [-Werror=int-conversion] 43 | return size * nmemb; | ~~~~~^~~~~~~ so I'd need to cast that. Gavin Henry. https://sentrypeer.org
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