duk_dup()
1.0.0 stack
プロトタイプ
c
void duk_dup(duk_context *ctx, duk_idx_t from_idx);スタック
| ... | val | ... | -> | ... | val | ... | val |
要約
Push a duplicate of value at from_idx to the stack. If from_idx is invalid, throws an error.
例
c
duk_push_int(ctx, 123); /* -> [ ... 123 ] */
duk_push_int(ctx, 234); /* -> [ ... 123 234 ] */
duk_dup(ctx, -2); /* -> [ ... 123 234 123 ] */参照
duk_dup_top