Лабораторная работа №3. Зайцев Михаил. 381906-1

[Zayyya]

No description provided.

[ElizJogar]

Please describe how to change the program code to get the following result:

int main() {
    float fooooo;
    int i = static_cast<int>(fooooo)      ;
    return 0;
}

for the origin test.cpp:

int main() {

    float fooooo;

    int i = (int)          fooooo      ;

    return 0;

}

[Zayyya]

Remove the opening bracket from _rewriter.ReplaceText(rParen, 1, ">(");
To add it, getSubExprAsWritten()->getBeginLoc() is usually used to get the initial position of the variable, then "(" is inserted at this token.

[ElizJogar]

Please describe the difference between the use of getRParenLoc() and getSubExprAsWritten()->getBeginLoc().

[Zayyya]

In this case:
getRParenLoc() gets the location of the closing brace before the variable.
getSubExprAsWritten()->getBeginLoc() gets the starting location of the variable, there may be spaces between the closing brace and the variable.

[ElizJogar]

• How to prevent parentheses from being added if they are already present in the (int)(f) code?
• How to prevent changing the C style cast code for a special case - when we want to suppress warnings about unused variables?

[Zayyya]

1. You can check the variable for the presence of brackets around it, for this you can use the asi function, it is a template and checks the parameter for belonging to the passed template type.
   In my case, you can check like this:

if (!isa<ParenExpr>(castExpr->getSubExprAsWritten())) {
   // Main code goes here
}

2. It is necessary to find out the type of operation required for the conversion, for this we use the getCastKind () function, calling it on castExpr. If the type is void, then you do not need to make changes to the source code.

if (castExpr->getCastKind() != CK_ToVoid) {
   // Main code goes here
}