最近在做一个项目,要求代码跨平台,因此要使用标准C++。其中要用到字符串分割,在网上找了一下,对其进行稍作修改可以实现字符串任意分割,如下程序,并有使用举例。
#include
#include
#include
#include
using namespace std;
typedef basic_string::size_type S_T;
static const S_T npos = -1;
////trim指示是否保留空串,默认为保留。tok可以为任意多个字符
vector tokenize(const string& src, string tok,
bool trim=false, string null_subst="")
{
if( src.empty() || tok.empty() )
throw "tokenize: empty string\0";
vector v;
S_T pre_index = 0, index = 0, len = 0;
while( (index = src.find_first_of(tok, pre_index)) !=npos )
{
if( (len = index-pre_index)!=0 )
v.push_back(src.substr(pre_index, len));
else if(trim==false)
v.push_back(null_subst);
pre_index = index+1;
}
string endstr = src.substr(pre_index);
if( trim==false ) v.push_back( endstr.empty()?null_subst:endstr );
else if( !endstr.empty() )
v.push_back(endstr);
return v;
}
//delimit为一个字符,严格分割
vector split(const string& src, string delimit, string null_subst="")
{
if( src.empty() || delimit.empty() )
throw "split:empty string\0";
vector v;
S_T deli_len = delimit.size();
long index = npos, last_search_position = 0;
while( (index=src.find(delimit,
last_search_position))!=npos )
{
if(index==last_search_position)
v.push_back(null_subst);
else
v.push_back( src.substr(last_search_position, index-
last_search_position) );
last_search_position = index + deli_len;
}
string last_one = src.substr(last_search_position);
v.push_back( last_one.empty()? null_subst:last_one );
return v;
}
测试如下:
int main(int argc, char* argv[])
{
string src = ",ab,cde;,,fg,," ;
string tok = ",;" ;
vector v1 = tokenize(src, tok ,true);
vector v2 = tokenize(src, tok ,false,
"");
cout<<"-------------v1:"< for(int i=0; i {
cout< }
cout<<"-------------v2:"< for(int j=0; j {
cout< }
try{
string s = "1;2;3;4";
string del = ";";//"###";
vector v3 = split(s, del, "");
cout<<"-------------v3:"< for(int k=0; k {
cout< }
}
catch (char *s) {
cout< }
return 0;
}
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