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name: duk_to_pointer
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proto: |
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void *duk_to_pointer(duk_context *ctx, duk_idx_t idx);
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stack: |
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[ ... val! ... ] -> [ ... pointer(val)! ... ]
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summary: |
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<p>Replaces the value at <code>idx</code> with a pointer-coerced value. Returns
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the resulting <code>void *</code> value. If <code>idx</code> is invalid, throws an
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error.</p>
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<p>Coercion rules:</p>
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<ul>
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<li>Pointer: coerces to itself, no change</li>
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<li>All heap allocated objects (string, object, buffer): coerce to a pointer
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which points to the Duktape internal heap header (use for debugging only,
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do not read/write)</li>
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<li>Other types: coerce to NULL</li>
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</ul>
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<div class="note">
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This API call is really only useful for debugging. Note in particular that
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the pointer returned must not be accessed, as it points to an internal heap
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header. This is the case even for string/buffer values: the returned pointer
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differs from the one returned by <code>duk_get_string()</code> and
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<code>duk_get_buffer()</code>.
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</div>
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example: |
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/* Don't dereference the pointer. */
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printf("coerced pointer: %p\n", duk_to_pointer(ctx, -3));
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tags:
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- stack
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introduced: 1.0.0
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