Почему в C++ предпочтение отдается подписанному, а не неподписанному? ⇐ C++

[Гость]

I'd like to understand better why choose

Код: Выделить всё

int

over

Код: Выделить всё

unsigned

?

Personally, I've never liked signed values unless there is a valid reason for them. e.g. count of items in an array, or length of a string, or size of memory block, etc., so often these things cannot possibly be negative. Such a value has no possible meaning. Why prefer

Код: Выделить всё

int

when it is misleading in all such cases?

I ask this because both Bjarne Stroustrup and Chandler Carruth gave the advice to prefer

Код: Выделить всё

int

over

Код: Выделить всё

unsigned

here (approx 12:30').

I can see the argument for using

Код: Выделить всё

int

over

Код: Выделить всё

short

or

Код: Выделить всё

long

-

Код: Выделить всё

int

is the "most natural" data width for the target machine architecture.

But signed over unsigned has always annoyed me. Are signed values genuinely faster on typical modern CPU architectures? What makes them better?


Источник: https://stackoverflow.com/questions/187 ... igned-in-c