I need to search an array of c-strings for a substring.
I created what I thought would return me the answer but it is only syntactically correct but semantically wrong, but I'm not sure where I have gone wrong.
There is also a sub-question to this. Which I will ask after showing you the example I tried.
#include <boost/algorithm/string/find.hpp>
const char Months[12][20] = {"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};
void Test()
{
typedef boost::iterator_range<boost::range_iterator<const char [20]>::type > constCharRange;
boost::iterator_range<char const *> ir = find_first("January", months);
}
ir.first == ir.last
The results of the iterator show that I have not written this correctly.
I'm not sure whether the fact that the first parameter is actually const char [8]
is having a detrimental effect.
My main question what should I do to correct it, and the supplemental question is how can I extract the type that find_first requires from constCharRange or indeed any such typedef.
Edit:
I see that I have used end incorrectly. I've then managed to get slightly different example to work however they are not compatible with the definitions I actually have to use (I can add to the code but not change the existing definition).
const std::string Months[]= { /*same data as before*/
void StringTest2()
{
const std::string* sptr =0;
sptr = std::find(boost::begin(Months), boost::end(Months), std::string("February"));
if (sptr)
{
string sResult(*sptr);
}
}
Another Test
const char* Months[]= { /*same data as before*/
void StringTest3()
{
const char **sptr = std::find(boost::begin(Months), boost::end(Months), "February");
if (sptr)
{
string sResult(*sptr);
}
}
Here is the nearest I can get, but I can't seem to get the return type spec correct
void StringTest4()
{
const char Months[12][20]Months[]= { /*same data as before*/
std::find(boost::begin(Months), boost::end(Months), "February");
}
I can correct StringTest4 to do exact matches, however this solution won't work for partial ones.
void StringTest4()
{
boost::range_iterator<const char [12][20]>::type sptr = std::find(boost::begin(Months), boost::end(Months), std::string("February"));
if (sptr)
{
string sResult(*sptr);
}
}
Note the passing of std::string rather than just "February"
if we don't do this then std::find
will just be doing a pointer comparison which would therefore result in failure.
I would still prefer to use this with string_algo, but I'm still not sure which bits I would need for it to successfully work with const char Months[12][20]