std :: string stream以二进制格式解析数字

Question

我需要解析std::string包含二进制格式的数字,例如:

0b01101101

我知道我可以使用std :: hex格式说明符来解析十六进制格式的数字.

std::string number = "0xff";
number.erase(0, 2);
std::stringstream sstream(number);
sstream << std::hex;
int n;
sstream >> n;

是否存在二进制格式的等价物？

Answer 1

您可以使用std::bitset字符串构造函数并将bistet转换为数字:

std::string number = "0b101";
//We need to start reading from index 2 to skip 0b
//Or we can erase that substring beforehand
int n = std::bitset<32>(number, 2).to_ulong();
//Be careful with potential overflow