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These simpler building blocks are defined in the VisualElement type and shown in Listing 12-9 For instance, there are no sums or products; these and similar expressions are broken down into sequences of symbols (such as 1, x, and +) The two other visual elements are exponentiation and fractions, which are used to guide the display logic later during the rendering phase Each visual element carries a size value that is calculated using a given set of rendering options..

/* Start the transaction and create a savepoint then register the transaction. */ if (txn->stmt == NULL && !(error= txn->tx_begin())) { txn->stmt= txn->new_savepoint(); trans_register_ha(thd, FALSE, &my_handler_hton); } DBUG_RETURN(error); } Starting a transaction from external_lock() is a bit more complicated. MySQL calls the external_lock() method for every table in use at the start of a transaction. Thus, you have some more work to do to detect the transaction and process it accordingly. This can be seen in the check of the trx->active_trans flag. The start transaction operation is also implied when the external_lock() method is called for the first table. Listing 7-59 shows an example implementation of the external_lock() method (some sections are omitted for brevity). See the ha_innodb.cc file for the complete code. Listing 7-59. Example external_lock() Method Implementation (from InnoDB) int ha_innobase::external_lock(THD* thd, int Lock_type) { row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt; trx_t* trx; DBUG_ENTER("ha_innobase::external_lock"); DBUG_PRINT("enter",("lock_type: %d", lock_type)); update_thd(thd); trx = prebuilt->trx; prebuilt->sql_stat_start = TRUE; prebuilt->hint_need_to_fetch_extra_cols = 0; prebuilt->read_just_key = 0; prebuilt->keep_other_fields_on_keyread = FALSE; if (lock_type == F_WRLCK) { /* If this is a SELECT, then it is in UPDATE TABLE ... or SELECT ... FOR UPDATE */ prebuilt->select_lock_type = LOCK_X; prebuilt->stored_select_lock_type = LOCK_X; }

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When used with numeric values, the binary comparison operators =, <>, <, <=, >, >=, min, and max perform comparisons according to the natural ordering for each particular numeric type. You can also use these operators on other data types, such as to compare lists of integers, and you can customize their behavior for new types you define. We discuss generic comparison in detail in 5, and we discuss customizing generic comparison in 8. When used with floating-point values, these operators implement the IEEE semantics for NaN (Not a Number) values. For example, (NaN = NaN) is false, as is (NaN <= NaN) and (NaN < NaN).

Listing 12-9. VisualExpr.fs (continued): Visual Elements and Sizes for the Visual Symbolic Differentiation Application type VisualElement = | Symbol of string * ExprSize | Power of VisualElement * VisualElement * ExprSize | Sequence of VisualElement list * ExprSize | Fraction of VisualElement * VisualElement * ExprSize member self.Size = match self with | Symbol (_, size) | Power (_, _, size) | Sequence (_, size) | Fraction (_, _, size) -> size member self.Height = self.Size.height member self.Width = self.Size.width member self.Midline = self.Size.midline and ExprSize = { width: int; height: int; midline: int; } member self.CenterOnMidline size x y = x + (size.width-self.width)/2, y + (size.midline-self.midline) member self.Frac size opt = { width = max self.width size.width; height = self.height + size.height + self.FracSepHeight opt; midline = self.height + (self.FracSepHeight opt)/2; } member self.FracSepHeight (opt: RenderOptions) = max (int (opt.Pen.Width*5.0f)) 4 member self.AddPower (e: VisualElement) = { width = self.width + e.Width; height = self.height + e.Height; midline = self.midline + e.Height; } static member { width height midline ExpandOne (size: ExprSize) (e: VisualElement) = = size.width + e.Width; = max size.height e.Height; = max size.midline e.Midline; }

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