C++14中binary literals的使用详解

int test_literal_1()
{
	int d = 42; // decimal notation
	int o = 052; // octal notation
	int x = 0x2a; // hexadecimal notation
	int X = 0X2A; // hexadecimal notation
	std::cout << "d:" << d << ", o:" << o << ", x:" << x << ", X:" << X << "\n"; // d:42, o:42, x:42, X:42
	auto v1 = 42U; // or 42u: 将从unsigned int, unsigned long和unsigned long long中选择能匹配的空间最小的一个作为其数据类型
	auto v2 = 42L; // or 42l: 字面值的类型至少是long
	auto v3 = 42UL; // or 42ul: 数据类型将根据具体数值情况或者取unsigned long,或者取unsigned long long
	std::cout << "v1:" << v1 << ", v2:" << v2 << ", v3:" << v3 << "\n"; // v1:42, v2:42, v3:42
	std::cout << "v1 type:" << typeid(v1).name() << ", v2 type:" << typeid(v2).name() << ", v3 type:" << typeid(v3).name() << "\n"; // v1 type:unsigned int, v2 type:long, v3 type:unsigned long
	return 0;
}

int test_literal_14_1()
{
	auto v1 = 0b110;
	auto v2 = 0b1111'1111;
	auto v3 = 0B1111'1111;
	std::cout << "v1:" << v1 << ", v2:" << v2 <<", v3:" << v3 << "\n"; // v1:6, v2:255, v3:255
	std::cout << "v1 type:" << typeid(v1).name()
		      << ", v2 type:" << typeid(v2).name()
		      << ", v3 type:" << typeid(v3).name() << "\n"; // v1 type:int, v2 type:int, v3 type:int
	auto v4 = 0b10U;
	auto v5 = 0B10L;
	auto v6 = 0b0000'0010ULL;
	std::cout << "v4:" << v4 << ", v5:" << v5 << ", v6:" << v6 << "\n"; // v4:2, v5:2, v6:2
	std::cout << "v4 type:" << typeid(v4).name()
			  << ", v5 type:" << typeid(v5).name()
			  << ", v6 type:" << typeid(v6).name() << "\n"; // v4 type:unsigned int, v5 type:long, v6 type:unsigned __int64
	return 0;
}