tools.cpp - split_string function didn't not cover some situations

[tianjixuetu]

/*!
 * 它接受一个std::string类型的字符串str和一个指向C风格字符串的指针sep作为参数。
 * 函数的目的是将str字符串按照sep指定的分隔符进行分割，并将分割后的子字符串存储在一个std::vector<std::string>中。
 * @param str: 待分割的字符串
 * @param sep: 分隔符
 * @return: 分隔之后的vector字符串
 */
std::vector<std::string> split_string(const std::string &str, const char *sep) {
    std::vector<std::string> res{};

    boost::algorithm::split(res, str, boost::is_any_of(sep));
    for ( auto &it: res ) {
        boost::algorithm::trim(it);
    }
    // 去除空字符串
    // res.erase(std::remove(res.begin(), res.end(), ""), res.end());
    return res;
}

for example, test some situation:

TEST_F(ToolsTestSplitString, s3){
    // 测试使用多个字符作为分隔符
    std::string str = "apple::banana::cherry::date";
    const char *sep = "::";
    std::vector<std::string> expected = {"apple", "banana", "cherry", "date"};
    std::vector<std::string> result = split_string(str, sep);
    EXPECT_EQ(expected, result);
}

it will not generate the expected std::vectorstd::string, because some element is "", so maybe it is better to add a code to remove "".
res.erase(std::remove(res.begin(), res.end(), ""), res.end());