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Remove_if Error can someone help?

Melicalol (26)
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 getline (file1,line);
		
		line.erase(
      std::remove_if(line.begin(), line.end(), &isdigit), // removes digits.
		line.end());


Error:
inputappointments.cpp: In function âVector<String> read_file(std::istream&)â:
inputappointments.cpp:54:56: error: no matching function for call to âremove_if(std::basic_string<char>::iterator, std::basic_string<char>::iterator, <unresolved overloaded function type>)â"



I posted Code on 2nd post




All the Error:


The error code:
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inputappointments.cpp: In function âVector<String> read_file(std::istream&)                                                                                  â:
inputappointments.cpp:54:56: error: no matching function for call to âremov                                                                                  e_if(std::basic_string<char>::iterator, std::basic_string<char>::iterator,                                                                                   <unresolved overloaded function type>)â
inputappointments.cpp:54:56: note: candidate is:
In file included from /usr/include/c++/4.7/algorithm:63:0,
                 from /usr/include/c++/4.7/regex:38,
                 from std_lib_facilities_3.h:28,
                 from inputappointments.cpp:18:
/usr/include/c++/4.7/bits/stl_algo.h:1160:5: note: template<class _FIter, c                                                                                  lass _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)
/usr/include/c++/4.7/bits/stl_algo.h:1160:5: note:   template argument dedu                                                                                  ction/substitution failed:
inputappointments.cpp:54:56: note:   couldn't deduce template parameter â_P                                                                                  redicateâ
inputappointments.cpp:57:66: error: no matching function for call to âremov                                                                                  e_if(std::basic_string<char>::iterator, std::basic_string<char>::iterator,                                                                                   <unresolved overloaded function type>)â
inputappointments.cpp:57:66: note: candidate is:
In file included from /usr/include/c++/4.7/algorithm:63:0,
                 from /usr/include/c++/4.7/regex:38,
                 from std_lib_facilities_3.h:28,
                 from inputappointments.cpp:18:
/usr/include/c++/4.7/bits/stl_algo.h:1160:5: note: template<class _FIter, c                                                                                  lass _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)
/usr/include/c++/4.7/bits/stl_algo.h:1160:5: note:   template argument dedu                                                                                  ction/substitution failed:
inputappointments.cpp:57:66: note:   couldn't deduce template parameter â_P                                                                                  redicateâ
inputappointments.cpp: In function âVector<int> read_file1(std::istream&)â:
inputappointments.cpp:82:22: error: no matching function for call to âgetli                                                                                  ne(std::istream&, int&)â
inputappointments.cpp:82:22: note: candidates are:
In file included from /usr/include/c++/4.7/cstdio:44:0,
                 from /usr/include/c++/4.7/ext/string_conversions.h:39,
                 from /usr/include/c++/4.7/bits/basic_string.h:2814,
                 from /usr/include/c++/4.7/string:54,
                 from /usr/include/c++/4.7/stdexcept:40,
                 from /usr/include/c++/4.7/array:39,
                 from std_lib_facilities_3.h:27,
                 from inputappointments.cpp:18:
/usr/include/stdio.h:675:20: note: __ssize_t getline(char**, size_t*, FILE*                                                                                  )
/usr/include/stdio.h:675:20: note:   candidate expects 3 arguments, 2 provi                                                                                  ded
In file included from /usr/include/c++/4.7/string:54:0,
                 from /usr/include/c++/4.7/stdexcept:40,
                 from /usr/include/c++/4.7/array:39,
                 from std_lib_facilities_3.h:27,
                 from inputappointments.cpp:18:
/usr/include/c++/4.7/bits/basic_string.h:2792:5: note: template<class _Char                                                                                  T, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::g                                                                                  etline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Tra                                                                                  its, _Alloc>&)
/usr/include/c++/4.7/bits/basic_string.h:2792:5: note:   template argument                                                                                   deduction/substitution failed:
inputappointments.cpp:82:22: note:   mismatched types âstd::basic_string<_C                                                                                  harT, _Traits, _Alloc>â and âintâ
In file included from /usr/include/c++/4.7/string:55:0,
                 from /usr/include/c++/4.7/stdexcept:40,
                 from /usr/include/c++/4.7/array:39,
                 from std_lib_facilities_3.h:27,
                 from inputappointments.cpp:18:
/usr/include/c++/4.7/bits/basic_string.tcc:1070:5: note: template<class _Ch                                                                                  arT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std:                                                                                  :getline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _T                                                                                  raits, _Alloc>&, _CharT)
/usr/include/c++/4.7/bits/basic_string.tcc:1070:5: note:   template argumen                                                                                  t deduction/substitution failed:
inputappointments.cpp:82:22: note:   mismatched types âstd::basic_string<_C                                                                                  harT, _Traits, _Alloc>â and âintâ
inputappointments.cpp:84:8: error: request for member âeraseâ in âlineâ, wh                                                                                  ich is of non-class type âintâ
inputappointments.cpp:85:27: error: request for member âbeginâ in âlineâ, w                                                                                  hich is of non-class type âintâ
inputappointments.cpp:85:41: error: request for member âendâ in âlineâ, whi                                                                                  ch is of non-class type âintâ
inputappointments.cpp:86:8: error: request for member âendâ in âlineâ, whic                                                                                  h is of non-class type âintâ
inputappointments.cpp:88:10: error: request for member âeraseâ in âlineâ, w                                                                                  hich is of non-class type âintâ
inputappointments.cpp:88:37: error: request for member âbeginâ in âlineâ, w                                                                                  hich is of non-class type âintâ
inputappointments.cpp:88:51: error: request for member âendâ in âlineâ, whi                                                                                  ch is of non-class type âintâ
inputappointments.cpp:89:8: error: request for member âendâ in âlineâ, whic                                                                                  h is of non-class type âintâ
inputappointments.cpp: At global scope:
inputappointments.cpp:103:1: error: expected unqualified-id before â{â toke                                                                                  n
Last edited on
Melicalol (26)
My code
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#include "std_lib_facilities_3.h"	
#include <iostream>
#include <vector>
#include <fstream>
#include <iterator>
#include <algorithm> 
   
   bool isdigit( char c ) {
    return isdigit( c );
}	 
 bool ispunct( char c ) {
    return ispunct( c );
} 
 bool isalpha( char c ) {
    return isalpha( c );
}

vector<string> read_file(istream& file1)
{
 /*ifstream ist(file1.c_str());                            // error with this c_str
	if (!ist)
	{
		error ("Can't open the input file ", file1);
	}*/

	vector<string> appointments1;              // we gonna use this  vector to store appointment names
	string line;
	//if (file1.is_open())
	//{
	
	  while ( file1.good() )                             //  assuming file1 is the input file
	  {
	
		getline (file1,line);
		
		line.erase(
      std::remove_if(line.begin(), line.end(), &isdigit), // removes digits.
		line.end());
		
	   line.erase( std::remove_if(line.begin(), line.end(), &ispunct),  //  
		line.end());
	  		appointments1.push_back(line);                      // nice and clean appointment
	  }
	//}

	//else cout << "Can't open file\n"; 
	return appointments1;
}

vector<int> read_file1(istream& file1)
{
  /*ifstream ist(file1.c_str());                            // error with this c_str
	if (!ist)
	{
		error ("Can't open the input file ", file1);
	}*/
	vector<int> dates;                // time to improvise, so we gonna store all the #s in here for now...
	int line;
	//if (file1.is_open())
	//{

	  while ( file1.good() )
	  {
	
		getline (file1,line);
		
		line.erase(
      std::remove_if(line.begin(), line.end(), &isalpha),    // removes words (alpha)
		line.end());
		
	   line.erase( std::remove_if(line.begin(), line.end(), &ispunct),  //  PUNCH THEM punctuations outta here!
		line.end());
	  		dates.push_back(line);
	  }
	//}

	//else cout << "Can't open file\n"; 
	return dates;
} 													// ok so now we have a dates vector,this vector is temporary and essential to make day and year vecotr [07032015]  month,days,year in each slot
	


	
                                   
vector<int> months1();							// we gonna load that vector and divide each slot by  1000000 since its int and not double, we will get the exact month
{
vector<int> dates = read_file1(file1.c_str());
for (int j = 0; j<dates.size()-1;++j){
		
	int	temp4 = dates[j] / 1000000 ;
		months1.push_back(temp4);
		}
		return months1;
}
		
		
		
vector<int> dayyear();            					// ok now we make another vector temporary call it dayyear,  by taking %  1000000 of  dates
{
vector<int> dates = read_file1(file1.c_str());

for (int j = 0; j<dates.size()-1;++j){
		int temp5 = dates[j] %1000000 ;
		dayyear.push_back(temp5);
		}
				return dayyear;
}

vector<int> days1;     // ok now we make  vector days1 divide temporary vector dayyear,  by /10000 gives us exact day.
{
vector<int>dayyear= dayyear();
for (int j = 0; j<dayyear.size()-1;++j){
		
	int	temp6 = dayyear[j] /10000 ;
		days1.push_back(temp6);
		}		
				return days1;
}
	
vector<int> years1;  // ok now we make  vector years1 modulo temporary vector dayyear,  by %10000 gives us exact year.
{
vector<int>dayyear= dayyear();
for (int j = 0; j<dayyear.size()-1;++j){
		
	int	temp7 = dayyear[j] %10000 ;
		years1.push_back(temp7);
		}
				return years1;
}
		
		
		

		
					
for (int j = 0; j<months1.size()-1 && j<years1.size()-1 && j<appointments1.size()-1;++j)
{
	int		temp1 = months1[j];
	int		temp2 = years1[j];
	string	temp3 = appointments1[j];	
		
	for(int i = 0; i<days1.size()-1;++i)
	{
		if (days1[i]> days1[i+1])
		{
			days1.push_back(i),
			months1.push_back(temp1);
			years1.push_back(temp2);
			appointments1.push_back(temp3);
		}
}
	}

	
	
	int main()
{	
	string file1;
	cout << "Please enter the name of the  input file \nEx: file1.txt \n";
	cin >> file1 
	 ifstream ist(file1.c_str());                            // error with this c_str
	if (!ist)
	{
		error ("Can't open the input file ", file1);
	}
	
	return 0;
}


Cubbi (4774)
There are two function overloads with the name "isdigit" in the standard library: int isdigit(int) and the template bool isdigit(CharT, const locale&);. You didn't say which one you wanted, so &isdigit is an attempt to take the address of an unresolved overloaded function, which cannot be compiled.

You can:
1) use a cast to request a particular overload: static_cast<int(*)(int)>(isdigit)
2) use a lambda: [](char c){return isdigit(c);}
3) (somewhat hackish) #include <ctype.h> (not cctype) and use the global namespace explicitly: ::isdigit
4) write a functor (if you don't have lambdas)
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