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4: A value parsing callback is another kind of callback function
5: available in libConfuse. This function is used to map a string into
6: some other other value. One example is to extend a boolean option
7: to accept the values "yes", "no" and "ask" (or perhaps "true",
8: "false" and "maybe"). Those values should be mapped to the integers
9: 1, 2 and 3.
10: </p><pre class="programlisting">
11: typedef int (*cfg_callback_t)(cfg_t *cfg, cfg_opt_t *opt,
12: const char *value, void *result);
13: </pre><p>
14:
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