Chapter 9. eUML operators and basic helpers
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## Chapter 9. eUML operators and basic helpers

The following table lists the supported operators:

Table 9.1. Operators and state machine helpers

eUML function / operator | Description | Functor
--- | --- | ---
&& | Calls lazily Action1&& Action2 | And_
|| | Calls lazily Action1|| Action2 | Or_
! | Calls lazily !Action1 | Not_
!= | Calls lazily Action1 != Action2 | NotEqualTo_
== | Calls lazily Action1 == Action2 | EqualTo_
> | Calls lazily Action1 > Action2 | Greater_
>= | Calls lazily Action1 >= Action2 | Greater_Equal_
< | Calls lazily Action1 < Action2 | Less_
<= | Calls lazily Action1 <= Action2 | Less_Equal_
& | Calls lazily Action1 & Action2 | Bitwise_And_
| | Calls lazily Action1 | Action2 | Bitwise_Or_
^ | Calls lazily Action1 ^ Action2 | Bitwise_Xor_
-- | Calls lazily --Action1 / Action1-- | Pre_Dec_ / Post_Dec_
++ | Calls lazily ++Action1 / Action1++ | Pre_Inc_ / Post_Inc_
/ | Calls lazily Action1 / Action2 | Divides_
/= | Calls lazily Action1 /= Action2 | Divides_Assign_
* | Calls lazily Action1 * Action2 | Multiplies_
*= | Calls lazily Action1 *= Action2 | Multiplies_Assign_
+ (binary) | Calls lazily Action1 + Action2 | Plus_
+ (unary) | Calls lazily +Action1 | Unary_Plus_
+= | Calls lazily Action1 += Action2 | Plus_Assign_
- (binary) | Calls lazily Action1 - Action2 | Minus_
- (unary) | Calls lazily -Action1 | Unary_Minus_
-= | Calls lazily Action1 -= Action2 | Minus_Assign_
% | Calls lazily Action1 % Action2 | Modulus_
%= | Calls lazily Action1 %= Action2 | Modulus_Assign_
>> | Calls lazily Action1 >> Action2 | ShiftRight_
>>= | Calls lazily Action1 >>= Action2 | ShiftRight_Assign_
<< | Calls lazily Action1 << Action2 | ShiftLeft_
<<= | Calls lazily Action1 <<= Action2 | ShiftLeft_Assign_
[] (works on vector, map, arrays) | Calls lazily Action1 [Action2] | Subscript_
if_then_else_(Condition,Action1,Action2) | Returns either the result of calling Action1 or the result of calling Action2 | If_Else_
if_then_(Condition,Action) | Returns the result of calling Action if Condition | If_Then_
while_(Condition, Body) | While Condition(), calls Body(). Returns nothing | While_Do_
do_while_(Condition, Body) | Calls Body() while Condition(). Returns nothing | Do_While_
for_(Begin,Stop,EndLoop,Body) | Calls for(Begin;Stop;EndLoop){Body;} | For_Loop_
process_(Event [,fsm1] [,fsm2] [,fsm3] [,fsm4]) | Processes Event on the current state machine (if no fsm specified) or on up to 4 state machines returned by an appropriate functor. | Process_
process2_(Event, Data [,fsm1] [,fsm2] [,fsm3]) | Processes Event on the current state machine (if no fsm specified) or on up to 2 state machines returned by an appropriate functor. The event is copy-constructed from what Data() returns. | Process2_
is_flag_(Flag [,fsm]) | Calls is_flag_active() on the current state machine or the one returned by calling fsm. | Get_Flag_
event_ [(attribute name)] | Returns the current event (as const reference) | GetEvent_
source_ [(attribute name)] | Returns the source state of the currently triggered transition (as reference). If an attribute name is provided, returns the attribute by reference. | GetSource_
target_ [(attribute name)] | Returns the target state of the currently triggered transition (as reference). If an attribute name is provided, returns the attribute by reference. | GetTarget_
state_ [(attribute name)] | Returns the source state of the currently active state (as reference). Valid inside a state entry/exit action. If an attribute name is provided, returns the attribute by reference. | GetState_
fsm_ [(attribute name)] | Returns the current state machine (as reference). Valid inside a state entry/exit action or a transition. If an attribute name is provided, returns the attribute by reference. | GetFsm_
substate_(state_name [,fsm]) | Returns (as reference) the state state_name referenced in the current state machine or the one given as argument. | SubState_

To use these functions, you need to include:

`#include <msm/front/euml/euml.hpp>`

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