c++ find function for vector<unsigned char>
I want to find empty space char " "
in my vector<unsigned char> message
vector<unsigned char>::iterator pos;
pos = find(message.begin(), message.end(), " ");
And I get an error:
/usr/include/c++/4.5/bits/stl_algo.h: In function ‘_RandomAccessIterator std::__find(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, std::random_access_iterator_tag) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<unsigned char*, std::vector<unsigned char> >, _Tp = char [2]]’:
/usr/include/c++/4.5/bits/stl_algo.h:4209:45: instantiated from ‘_IIter std::find(_IIter, _IIter, const _Tp&) [with _IIter = __gnu_cxx::__normal_iterator<unsigned char*, std::vector<unsigned char> >, _Tp = char [2]]’
../source/InveritasServer.cpp:107:49: instantiated from here
/usr/include/c++/4.5/bits/stl_algo.h:158:4: error: ISO C++ forbids comparison between pointer and integer
/usr/include/c++/4.5/bits/stl_algo.h:4209:45: instantiated from ‘_IIter std::find(_IIter, _IIter, const _Tp&) [with _IIter = __gnu_cxx::__normal_iterator<unsigned char*, std::vector<unsigned char> >, _Tp = char [2]]’
../source/InveritasServer.cpp:107:49: instantiated from here
/usr/include/c++/4.5/bits/stl_algo.h:162:4: error: ISO C++ forbids comparison between pointer and integer
/usr/include/c++/4.5/bits/stl_algo.h:166:4: error: ISO C++ forbids comparison between pointer and integer
/usr/include/c++/4.5/bits/stl_algo.h:170:4: error: ISO C++ forbids comparison between pointer and integer
/usr/include/c++/4.5/bits/stl_algo.h:178:4: error: ISO C++ forbids comparison between pointer and integer
/usr/include/c++/4.5/bits/stl_algo.h:182:4: error: ISO C++ forbids comparison between pointer and integer
/usr/include/c++/4.5/bits/stl_algo.h:186:4: error: ISO C++ forbids comparison between p开发者_开发技巧ointer and integer
You should use ' '
instead of " "
:
pos = find(message.begin(), message.end(), ' ');
Note that " "
is string literal, while ' '
is character literal. What you need to provide as third argument is character literal, because message
is a vector of chars, not of strings.
You are searching for a string, rather than an unsigned char
.
Try this. Notice the single quotes.
pos = find(message.begin(), message.end(), ' ');
It is a vector of "unsigned char" and you are trying to find in it a string. Send an unsigned char type.
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