bugprone-too-small-loop-variable¶
Detects those for
loops that have a loop variable with a “too small” type
which means this type can’t represent all values which are part of the
iteration range.
int main() {
long size = 294967296l;
for (short i = 0; i < size; ++i) {}
}
This for
loop is an infinite loop because the short
type can’t represent
all values in the [0..size]
interval.
In a real use case size means a container’s size which depends on the user input.
int doSomething(const std::vector& items) {
for (short i = 0; i < items.size(); ++i) {}
}
This algorithm works for small amount of objects, but will lead to freeze for a a larger user input.