=proto
void duk_require_stack(duk_context *ctx, unsigned int extra);

=summary
<p>Like <tt><a href="#duk_check_stack">duk_check_stack()</a></tt> but an
error is thrown if the value stack needs to be reallocated and that
reallocation fails.</p>

<p>As a general rule, callers should use this function to reserve more
stack space.  If value stack cannot be extended, there is almost never a
useful recovery strategy except to throw an error and unwind.</p>

=example
int nargs;

nargs = duk_get_top(ctx);  /* number or arguments */

/* reserve space for one temporary for each input argument */
duk_require_stack(ctx, nargs * 2);

=tags
stack

=seealso
duk_check_stack