code to transform assignment statement

[clement N]

In preparing a C++ source file, a programmer has wrtten the assignment statement in long-hand form as shown

a=a+12;
rather than in its short-hand form
a+=12
Develop a class which reads the source file and provides the necessary operations for replacing the assignment statements as listed below

a=a+...; by a+=..;
a=a-...; by a-=..;
a=a*...; by a*=..;
a=a/...; by a/=..;

[Ganon11]

OK...very interesting...so what?

[JosAH]

OK...very interesting...so what?

I'd say: extremely interesting; totally useless but extremely interesting nevertheless.
First you have to preprocess the translation unit; next you have to parse the whole
thing down to the expression level; if you find an assignment where the lvalue
equals the left operand of the rvalue on the right of the compound assignment
operator apply the transformation.

Things become interesting when the lvalue and the left hand operand are aliases
of each other:

int a= 42;
int* pa= &a;
a= *pa+1;

and what about modified aliases?

int a= 42;
int* pa= &a;
a= *pa+++1;

Extremely interesting; useless and undoable; but extremely interesting ;-)

kind regards,

Jos