字符串处理相关函数

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//删除字符串开头的空格
void trim_left(string & str)
{
auto it = std::find_if_not(str.begin(), str.end(), isspace);
str.erase(str.begin(),it );
}
//删除字符串结尾的空格
void trim_right(string & str)
{
while (std::isspace(str.back()))
{
str.pop_back();
}
}
//删除字符串两端的空格
void trim(string & str)
{
trim_left(str);
trim_right(str);
}
//用char字符分隔字符串str,分隔符只有一个
vector<string> split_by_char(const string & str, char delim, bool compress_token = true)
{
vector<string> ret;
string tmp;
for (auto it = str.begin(); it != str.end();++it)
{
if (*it != delim)
{
tmp.push_back(*it);
}
else
{
if (tmp.empty())
{
if (compress_token == false)
{
ret.push_back(tmp);
}
}
else
{
ret.push_back(tmp);
tmp.clear();
}
}
}
if (!tmp.empty())
{
ret.push_back(tmp);
}
return ret;
}
//用delim中任意字符分隔字符串str,分隔符可支持多个
vector<string> split_by_str(const string & str,const string & delim, bool compress_token = true)
{
vector<string> ret;
size_t start=0;
size_t end=0;
while (1)
{
end = str.find_first_of(delim,start);
if (end == string::npos)
{
break;
}
string tmp = str.substr(start, end - start);
if (tmp.empty())
{
if (compress_token==false)
{
ret.emplace_back(std::move(tmp));
}
}
else
{
ret.emplace_back(std::move(tmp));
}
start = end + 1;
}
string tmp = str.substr(start);
if (!tmp.empty())
{
ret.emplace_back(std::move(tmp));
}
return ret;
}