Man page - sdl_qsort_r(3)

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Manual

SDL_qsort_r

NAME
HEADER FILE
SYNOPSIS
DESCRIPTION
FUNCTION PARAMETERS
THREAD SAFETY
AVAILABILITY
SEE ALSO

NAME

SDL_qsort_r - Sort an array, passing a userdata pointer to the compare function.

HEADER FILE

Defined in SDL3/SDL_stdinc.h

SYNOPSIS

#include "SDL3/SDL.h"

void SDL_qsort_r(void *base, size_t nmemb, size_t size, SDL_CompareCallback_r compare, void *userdata);

DESCRIPTION

For example:

typedef enum {
sort_increasing,
sort_decreasing,
} sort_method;

typedef struct {
int key;
const char *string;
} data;

int SDLCALL compare(const void *userdata, const void *a, const void *b)
{
sort_method method = (sort_method)(uintptr_t)userdata;
const data *A = (const data *)a;
const data *B = (const data *)b;

if (A->key < B->key) {
return (method == sort_increasing) ? -1 : 1;
} else if (B->key < A->key) {
return (method == sort_increasing) ? 1 : -1;
} else {
return 0;
}
}

data values[] = {
{ 3, "third" }, { 1, "first" }, { 2, "second" }
};

SDL_qsort_r(values, SDL_arraysize(values), sizeof(values[0]), compare, (const void *)(uintptr_t)sort_increasing);

FUNCTION PARAMETERS

	base		a pointer to the start of the array.
	nmemb		the number of elements in the array.
	size		the size of the elements in the array.

compare

a function used to compare elements in the array.

userdata

a pointer to pass to the compare function.

THREAD SAFETY

It is safe to call this function from any thread.

AVAILABILITY

This function is available since SDL 3.2.0.