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<div class="note">
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Default pointer values given to duk_opt_xxx() and duk_get_xxx_default() are
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not tracked by Duktape, e.g. duk_opt_string() does not make a copy of the
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default string argument. The caller is responsible for ensuring that the
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default pointer remains valid for its intended use. For example,
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duk_opt_string(ctx, 3, "localhost") works fine because a string constant is
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always valid, but if the argument is a libc allocated string, caller must
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ensure the pointer returned from duk_opt_string() is not used beyond the
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lifetime of the libc allocated string.
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</div>
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