I want to change member of structure under double pointer. Do you know how?
Example code
typedef struct { int member; } Ttype; void changeMember(Ttype **foo) { //I don`t know how to do it //maybe *foo->member = 1; } 4 Answers
Try
(*foo)->member = 1; You need to explicitly use the * first. Otherwise it's an attempt to dereference member.
3Due to operator precedence, you need to put parentheses around this:
(*foo)->member = 1; You can use a temp variable to improve readability. For example:
Ttype *temp = *foo; temp->member = 1; If you have control of this and allowed to use C++, the better way is to use reference. For example:
void changeMember(Ttype *&foo) { foo->member = 1; } maybe (*foo)->member = 1 (if it's dynamically allocated)
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