What is the aim of `(void) a;`?

Asked Jun 11 '18 at 19:49

Active Jun 11 '18 at 19:49

Viewed 57 times

I discovered in the SDL2 sources something weird.

while (renderer->textures) {
    SDL_Texture *tex = renderer->textures; (void) tex;
    SDL_DestroyTexture(renderer->textures);
    SDL_assert(tex != renderer->textures);  /* satisfy static analysis. */
}

The loop itself is just a linked list iteration (SDL_DestroyTexturemodifies renderer->textures). But there is (void) tex; which I don't understand : it seems like a cast to void, but what is the objective ? tex is just a pointer so there is no need to evaluate it, and the return value of the cast isn't stored (if storing void is even possible ...).

Thanks for anyone helping !

asked Jun 11 '18 at 19:49

Julien Vernay

@UnholySheep Here `tex` isn't a function parameter and it is used after – Julien Vernay Jun 11 '18 at 19:52
2

Related info: [here](https://stackoverflow.com/a/777359/509868) – anatolyg Jun 11 '18 at 19:54
1

It's a way to silence warnings of the form "warning: 'tex' is unused in function 'blahblahblah'". – Steve Summit Jun 11 '18 at 20:00
@anatolyg Thanks ! is there a way to set your link as the duplicate one instead of the current one ? – Julien Vernay Jun 11 '18 at 20:01
@JulienVernay You're asking for an existing question to be marked as duplicate and reference yours? – Thomas Jager Jun 11 '18 at 20:03
In case someone wants to vote for the other link, here is the link to that other question: https://stackoverflow.com/q/777261/509868 – anatolyg Jun 11 '18 at 20:05

What is the aim of `(void) a;`?

0 Answers0