signed int vs int-有没有办法在C ++中将它们区分开？

Question

是否有一个模板或方法可用于区分声明signed int和int，如以下示例所示

signed int foo;
int bar;
static_assert(magic_signed<decltype(foo)>::value,"signed"); //PASS
static_assert(magic_signed<decltype(bar)>::value,"not signed"); //ASSERT

Answer 1

尽管signed int和int是相同的，但我认为您可能想说的是如何区分unsigned int和int。看一下std::is_signed。在c ++ 11之后可用。

https://en.cppreference.com/w/cpp/types/is_signed

还有一个std::is_unsigned

https://en.cppreference.com/w/cpp/types/is_unsigned

如果您实际上是要区分signed int和普通int，我认为您不能这样做，因为int被隐式理解为signed int。编译器，所以它们实际上是完全一样的。

也来看看这个。 Difference between int and signed int declaration

Answer 2

int，signed int和signed是同一类型。

unsigned int和unsigned是同一类型。