Question

I think I am clear on the difference between delete and delete []. The question I am asking here is: sometimes I do have typo and use the wrong one. Then it may or may not crash and normally ends up with hours of debugging.

I wish gcc can detect and give warning on possible misusage on a few simplest cases.
I still have to use “new float[size]” from time to time because of legacy functions that I need to call, so I am more interested in find an error checking tool to catch part of these mistakes.

Answer 1

I wish gcc can detect and give warning on possible misuage on a few simplest cases.

Use valgrind.

I still have to use new float[size] from time to time because of legacy functions that I need to call

No, you don’t. If a legacy function wants a pointer to the first element of an array of floats, do this:

std::vector<float> numbers(10);
legacy_func(&numbers[0]);

Don’t do this:

float *numbers = new float[10];
legacy_func(numbers);
delete[] numbers;