blocks|key|2885792|text|如果你不反对提振，boost.tokenizer就足够灵活地解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2885793|#include+<string>
#include+<iostream>
#include+<boost/tokenizer.hpp>

void+split_and_show(const+std::string+s)
{
++++boost::char_separator<char>+sep("+",+"",+boost::keep_empty_tokens);
++++boost::tokenizer<boost::char_separator<char>+>+tok(s,+sep);
++++for(auto+i+=+tok.begin();+i!=tok.end();+%2B%2Bi)
++++++++++++std::cout+<<+'"'+<<+*i+<<+"\"\n";
}
int+main()
{
++++split_and_show("This+is+a+string");
++++split_and_show("This++is+a+string");

}|code-block|syntax|javascript|2885794|测试：https://ideone.com/mN2sR|offset|length|2885795|entityMap|0|LINK|mutability|MUTABLE|url|https://ideone.com/mN2sR^0|0|0|3|O|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

If you are not averse to boost, boost.tokenizer is flexible enough to solve this

<pre><code>#include &lt;string&gt;
#include &lt;iostream&gt;
#include &lt;boost/tokenizer.hpp&gt;

void split_and_show(const std::string s)
{
 boost::char_separator&lt;char&gt; sep(" ", "", boost::keep_empty_tokens);
 boost::tokenizer&lt;boost::char_separator&lt;char&gt; &gt; tok(s, sep);
 for(auto i = tok.begin(); i!=tok.end(); ++i)
 std::cout &lt;&lt; '"' &lt;&lt; *i &lt;&lt; "\"\n";
}
int main()
{
 split_and_show("This is a string");
 split_and_show("This is a string");

}
</code></pre>

test: <a href="https://ideone.com/mN2sR" rel="nofollow">https://ideone.com/mN2sR</a>

blocks|key|2885808|text|你能用助推吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2885809|samm$+cat+split.cc
#include+<boost/algorithm/string/classification.hpp>
#include+<boost/algorithm/string/split.hpp>

#include+<boost/foreach.hpp>

#include+<iostream>
#include+<string>
#include+<vector>

int
main()
{
++++std::string+split_me(+"hello+world++how+are+++you"+);

++++typedef+std::vector<std::string>+Tokens;
++++Tokens+tokens;
++++boost::split(+tokens,+split_me,+boost::is_any_of("+")+);

++++std::cout+<<+tokens.size()+<<+"+tokens"+<<+std::endl;
++++BOOST_FOREACH(+const+std::string&+i,+tokens+)+{
++++++++std::cout+<<+"'"+<<+i+<<+"'"+<<+std::endl;
++++}
}|code-block|syntax|javascript|2885810|示例执行：|2885811|samm$+./a.out
8+tokens
'hello'
'world'
''
'how'
'are'
''
''
'you'
samm$+|2885812|entityMap|0|LINK|mutability|MUTABLE|url|http://www.boost.org/doc/libs/1_46_1/doc/html/string_algo.html^0|3|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Can you use <a href="http://www.boost.org/doc/libs/1_46_1/doc/html/string_algo.html" rel="noreferrer">boost</a>?

<pre><code>samm$ cat split.cc
#include &lt;boost/algorithm/string/classification.hpp&gt;
#include &lt;boost/algorithm/string/split.hpp&gt;

#include &lt;boost/foreach.hpp&gt;

#include &lt;iostream&gt;
#include &lt;string&gt;
#include &lt;vector&gt;

int
main()
{
 std::string split_me( "hello world how are you" );

 typedef std::vector&lt;std::string&gt; Tokens;
 Tokens tokens;
 boost::split( tokens, split_me, boost::is_any_of(" ") );

 std::cout &lt;&lt; tokens.size() &lt;&lt; " tokens" &lt;&lt; std::endl;
 BOOST_FOREACH( const std::string&amp; i, tokens ) {
 std::cout &lt;&lt; "'" &lt;&lt; i &lt;&lt; "'" &lt;&lt; std::endl;
 }
}
</code></pre>

sample execution:

<pre><code>samm$ ./a.out
8 tokens
'hello'
'world'
''
'how'
'are'
''
''
'you'
samm$ 
</code></pre>

blocks|key|2527566|text|如果你不喜欢提振，你可以使用常规的老operator>>和std::noskipws。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2527567|编辑:测试后的更新。|2527568|#include+<iostream>
#include+<iomanip>
#include+<vector>
#include+<string>
#include+<algorithm>
#include+<iterator>
#include+<sstream>

void+split(const+std::string&+str,+std::vector<std::string>&+v)+{
++std::stringstream+ss(str);
++ss+>>+std::noskipws;
++std::string+field;
++char+ws_delim;
++while(1)+{
++++if(+ss+>>+field+)
++++++v.push_back(field);
++++else+if+(ss.eof())
++++++break;
++++else
++++++v.push_back(std::string());
++++ss.clear();
++++ss+>>+ws_delim;
++}
}

int+main()+{
++std::vector<std::string>+v;
++split("hello+world++how+are+++you",+v);
++std::copy(v.begin(),+v.end(),+std::ostream_iterator<std::string>(std::cout,+"-"));
++std::cout+<<+"\n";
}|code-block|syntax|javascript|2527569|http://ideone.com/62McC|2527570|entityMap|0|LINK|mutability|MUTABLE|url^0|I|A|T|D|0|0|0|0|N|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|O|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|N]]]]

If you are averse to boost, you can use regular old <code>operator&gt;&gt;</code>, along with <code>std::noskipws</code>:

EDIT: updates after testing.

<pre><code>#include &lt;iostream&gt;
#include &lt;iomanip&gt;
#include &lt;vector&gt;
#include &lt;string&gt;
#include &lt;algorithm&gt;
#include &lt;iterator&gt;
#include &lt;sstream&gt;

void split(const std::string&amp; str, std::vector&lt;std::string&gt;&amp; v) {
 std::stringstream ss(str);
 ss &gt;&gt; std::noskipws;
 std::string field;
 char ws_delim;
 while(1) {
 if( ss &gt;&gt; field )
 v.push_back(field);
 else if (ss.eof())
 break;
 else
 v.push_back(std::string());
 ss.clear();
 ss &gt;&gt; ws_delim;
 }
}

int main() {
 std::vector&lt;std::string&gt; v;
 split("hello world how are you", v);
 std::copy(v.begin(), v.end(), std::ostream_iterator&lt;std::string&gt;(std::cout, "-"));
 std::cout &lt;&lt; "\n";
}
</code></pre>

<a href="http://ideone.com/62McC" rel="nofollow">http://ideone.com/62McC</a>

blocks|key|2885866|text|您可以使用简单的strtok()函数(*)从这里开始。注意，标记是在分隔符上创建的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2885867|#include+<stdio.h>
#include+<string.h>

int+main+()
{
++char+str[]+="-+This+is+a+string";
++char+*+pch;
++printf+("Splitting+string+\"%25s\"+into+tokens:\n",str);
++pch+=+strtok+(str,"+,.-");
++while+(pch+!=+NULL)
++{
++++printf+("%25s\n",pch);
++++pch+=+strtok+(NULL,+"+,.-");
++}
++return+0;
}|code-block|syntax|javascript|2885868|entityMap|0|LINK|mutability|MUTABLE|url|http://www.cplusplus.com/reference/clibrary/cstring/strtok/^0|L|5|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You could used simple strtok() function (*)<a href="http://www.cplusplus.com/reference/clibrary/cstring/strtok/" rel="nofollow">From here</a>. Note that tokens are created on delimiters

<pre><code>#include &lt;stdio.h&gt;
#include &lt;string.h&gt;

int main ()
{
 char str[] ="- This is a string";
 char * pch;
 printf ("Splitting string \"%s\" into tokens:\n",str);
 pch = strtok (str," ,.-");
 while (pch != NULL)
 {
 printf ("%s\n",pch);
 pch = strtok (NULL, " ,.-");
 }
 return 0;
}
</code></pre>

blocks|key|2527618|text|你也可以用旧的时尚“strtok”|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2527619|http://www.cplusplus.com/reference/clibrary/cstring/strtok/|offset|length|2527620|它有点摇摇欲坠，但不涉及使用boost+(不是说boost是一件坏事)。|2527621|基本上，使用要拆分的字符串和分隔符(在本例中是空格)调用strtok，它将返回char*。|2527622|从链接中：|2527623|#include+<stdio.h>
#include+<string.h>

int+main+()
{
++char+str[]+="-+This,+a+sample+string.";
++char+*+pch;
++printf+("Splitting+string+\"%25s\"+into+tokens:\n",str);
++pch+=+strtok+(str,"+,.-");
++while+(pch+!=+NULL)
++{
++++printf+("%25s\n",pch);
++++pch+=+strtok+(NULL,+"+,.-");
++}
++return+0;
}|code-block|syntax|javascript|2527624|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1N|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|F|3|G|5|6|7|12|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|13|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|14|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|15|8|@]|9|@]|A|$O|P]]|$1|Q|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|C]]]]

You could also just use the old fashion 'strtok'

<a href="http://www.cplusplus.com/reference/clibrary/cstring/strtok/" rel="nofollow">http://www.cplusplus.com/reference/clibrary/cstring/strtok/</a>

Its a bit wonky but doesn't involve using boost (not that boost is a bad thing).

You basically call strtok with the string you want to split and the delimiter (in this case a space) and it will return you a char*. 

From the link:

<pre><code>#include &lt;stdio.h&gt;
#include &lt;string.h&gt;

int main ()
{
 char str[] ="- This, a sample string.";
 char * pch;
 printf ("Splitting string \"%s\" into tokens:\n",str);
 pch = strtok (str," ,.-");
 while (pch != NULL)
 {
 printf ("%s\n",pch);
 pch = strtok (NULL, " ,.-");
 }
 return 0;
}
</code></pre>

blocks|key|1330838|text|如果严格地说，一个空格字符是分隔符，那么std::getline可能是有效的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1330839|例如：|1330840|int+main()+{
++using+namespace+std;
++istringstream+iss("This++is+a+string");
++string+s;
++while+(+getline(+iss,+s,+'+'+)+)+{
++++printf(+"`%25s'\n",+s.c_str()+);
++}
}|code-block|syntax|javascript|1330841|entityMap^0|K|C|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

If strictly one space character is the delimiter,
probably <code>std::getline</code> will be valid. 
For example:

<pre><code>int main() {
 using namespace std;
 istringstream iss("This is a string");
 string s;
 while ( getline( iss, s, ' ' ) ) {
 printf( "`%s'\n", s.c_str() );
 }
}
</code></pre>

blocks|key|1330843|text|您甚至可以开发自己的拆分功能(我知道，有点过时)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1330844|size_t+split(const+std::string+&txt,+std::vector<std::string>+&strs,+char+ch)
{
++++size_t+pos+=+txt.find(+ch+);
++++size_t+initialPos+=+0;
++++strs.clear();

++++//+Decompose+statement
++++while(+pos+!=+std::string::npos+)+{
++++++++strs.push_back(+txt.substr(+initialPos,+pos+-+initialPos+)+);
++++++++initialPos+=+pos+%2B+1;

++++++++pos+=+txt.find(+ch,+initialPos+);
++++}

++++//+Add+the+last+one
++++strs.push_back(+txt.substr(+initialPos,+std::min(+pos,+txt.size()+)+-+initialPos+%2B+1+)+);

++++return+strs.size();
}|code-block|syntax|javascript|1330845|然后只需要用一个向量作为参数调用它：|1330846|int+main()
{
++++std::vector<std::string>+v;

++++split(+"This++is+a++test",+v,+'+'+);
++++dump(+cout,+v+);

++++return+0;
}|1330847|找到在IDEone中拆分字符串的代码。|offset|length|1330848|希望这能有所帮助。|1330849|entityMap|0|LINK|mutability|MUTABLE|url|https://ideone.com/1RCZM8^0|0|0|0|0|2|G|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@$M|13|N|14|1|15]]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

You can even develop your own split function (I know, little old-fashioned):

<pre><code>size_t split(const std::string &amp;txt, std::vector&lt;std::string&gt; &amp;strs, char ch)
{
 size_t pos = txt.find( ch );
 size_t initialPos = 0;
 strs.clear();

 // Decompose statement
 while( pos != std::string::npos ) {
 strs.push_back( txt.substr( initialPos, pos - initialPos ) );
 initialPos = pos + 1;

 pos = txt.find( ch, initialPos );
 }

 // Add the last one
 strs.push_back( txt.substr( initialPos, std::min( pos, txt.size() ) - initialPos + 1 ) );

 return strs.size();
}
</code></pre>

Then you just need to invoke it with a vector&lt;string&gt; as argument:

<pre><code>int main()
{
 std::vector&lt;std::string&gt; v;

 split( "This is a test", v, ' ' );
 dump( cout, v );

 return 0;
}
</code></pre>

Find <a href="https://ideone.com/1RCZM8" rel="noreferrer">the code for splitting a string in IDEone</a>.

Hope this helps.

<blockquote>
 Possible Duplicate: 
 <a href="https://stackoverflow.com/questions/236129/how-to-split-a-string-in-c">How to split a string in C++?</a> 
</blockquote>



I need to split a string by single spaces and store it into an array of strings. I can achieve this using a istringstream, but what I am not being able to achieve is this:

I want every space to terminate the current word. So, if there are two spaces consecutively, one element of my array should be blank.

For example:

(underscore denotes space)

<pre><code>This_is_a_string.
gets split into:
A[0] = This
A[1] = is
A[2] = a
A[3] = string.

This__is_a_string.
gets split into:
A[0] = This
A[1] = ""
A[2] = is
A[3] = a
A[4] = string.
</code></pre>

How can I implement this?

Split string by single spaces

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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可能重复：我需要将字符串拆分为单个空格，并将其存储到字符串数组中。我可以使用istringstream实现这一点，但我无法做到的是：我希望每个空格都能终止当前的单词。因此，如果连续有两个空格，则数组中的一个元素应为空。例如：(下划线表示空格)This_is_a_string.gets split into:A[0] =...

问按单个空格拆分字符串
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