c++ - 无法将 boost::regex 定义为私有(private)变量

Question

在下面的代码中，我得到了错误。我在做什么？

regex.cpp:11: 错误:字符串常量之前需要标识符

regex.cpp:11: 错误:字符串常量前需要‘,’或‘...’

#include <boost/regex.hpp>
#include <iostream>
#include <string>


class RH
{
public:
    bool  matches(const std::string & str);
private:
    boost::regex regex_("\\d:\\d-\\d:\\d"); // this is where error points to
};

Answer 1

必须在构造函数中初始化:

class RH {
...
public:
    RH() : regex_("\\d:\\d-\\d:\\d") {}
...
private:
    boost::regex regex_;
}