Forum: C++, En övn med funktionsobjekt

 
#include "vector.h"
#include <iostream>
#include <ctype.h>
#include <stdlib.h>
using namespace std;
 
class IsVokal {   // funktionsobjekt 
public:
    // return true if c is a vocal
    bool operator() ( char c ) { 
    // vill ta med ä å ö. Men får en varning 
    // varning: flerteckens teckenkonstant
        if ( c == ('a' || 'e' || 'i' || 'o' || 'u' || 'y') )
             return true;
        return false;
    }
};
 
 
template <class A,class B,class Condition>
void vokal(Vector<A> &src,Vector<B> &dest,Condition cond) {
 
    dest.resize( src.size() );
    for ( int i = 0; i < src.size();i++ ){
        if ( cond( src[i] ) )
            dest.push_back( src[i] );
    }
}
 
 
int main(){
 
Vector<char> v1,v2;
 
v1.push_back('f');
v1.push_back('t');
v1.push_back('a');
v1.push_back('s');
v1.push_back('e');
v1.push_back('g');
 
 
vokal(v1,v2,IsVokal());
 
for ( int i=0; i < v2.size();i++)
   cout << v2[i] << endl;
 
return 0;
}
 

 
        if ( c =='a'||c == 'e'||c=='i'||c=='o'||c=='u'||c=='y')
             return true;
        return false;
    }
 
};
 

 
class IsVokal {
 
public:
 
    // return true if c is a vocal
 
    bool operator() ( char c ) { 
        if ( c =='a'||c == 'e'||c=='i'||c=='o'||c=='u'||c=='y')
             return true;
        return false;
    }
};
 

 
if ( c =='a'||c == 'e'||c=='i'||c=='o'||c=='u'||c=='y' || c == 'å' || c == 'ä' || c == 'ö')
 

 
#include <iostream>
#include <vector>
#include <string>
 
using namespace std;
 
class isVocal {
public:
	isVocal () {}
	~isVocal () {}
 
	bool operator() (char c) {
		switch (c) {
			case 'a':
			case 'e':
			case 'i':
			case 'o':
			case 'u':
			case 'y':
			case 'å':
			case 'ä':
			case 'ö':
				return true;
			default:
				return false;
		};
	}
};
 
template<class T1, class T2, class Condition>
void pickVocals (vector<T1> &A, vector<T2> &B, Condition cond)
{
	B.resize (A.size());
	
	vector<T1>::iterator it = A.begin ();
	for (; it != A.end(); ++it) {
		if (cond(*it))
			B.push_back (*it);
	}
}
 
template<class T1>
void printVector (vector<T1> &v)
{
	vector<T1>::iterator it = v.begin ();
	for (; it != v.end(); ++it) {
		cout << *it << endl;
	}
}
 
int main(int argc, char *argv)
{
	vector<char> v1, v2;
 
	std::string sText = "Ich bin ein textstringen!";
	
	std::string::iterator it = sText.begin ();
	for (; it != sText.end(); ++it) {
		v1.push_back (*it);
	}
 
	pickVocals (v1, v2, isVocal());
 
	printVector (v2);
 
	return 0;
}