Ciao a tutti.
Sto provando a scrivere un template di classi che rappresenterebbero dei vettori nel senso matematico del termine. Questa classe eredita direttamente da std::vector<T>.
Tutto sembra andare per il meglio quando compilo con un main() vuoto, ma appena cerco di instanziare ed utilizzare la mia classe ottengo un errore strano:
È come se il compilatore non trova l'implementazione della classe ma davvero non capisco come mai.codice:Undefined symbols for architecture x86_64: "Vector<int>::Vector(unsigned long)", referenced from: _main in testVector.o "std::basic_ostream<char, std::char_traits<char> >& operator<< <int>(std::basic_ostream<char, std::char_traits<char> >&, Vector<int> const&)", referenced from: _main in testVector.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status make: *** [testVector] Error 1 macbook-di-rocco-meli:Simulation roccomeli$ make clean rm -f *.o macbook-di-rocco-meli:Simulation roccomeli$ make g++gcc-4.6.x -std=c++0x -c -o testVector.o testVector.cc g++gcc-4.6.x -std=c++0x -c -o Vector.o Vector.cc g++gcc-4.6.x testVector.o Vector.o -o testVector Undefined symbols for architecture x86_64: "Vector<int>::Vector(unsigned long)", referenced from: _main in testVector.o "std::basic_ostream<char, std::char_traits<char> >& operator<< <int>(std::basic_ostream<char, std::char_traits<char> >&, Vector<int> const&)", referenced from: _main in testVector.o ld: symbol(s) not found for architecture x86_64 collect2: ld returned 1 exit status make: *** [testVector] Error 1
Ecco il mio codice:
codice:CC = g++gcc-4.6.x CXX = g++gcc-4.6.x CXXFLAGS = -std=c++0x all: testVector # --- TEST VECTOR --- testVector: testVector.o Vector.o testVector.o: testVector.cc Vector.h # --- CLASSES --- Vector.o: Vector.h Vector.cc clean: rm -f *.ocodice:#include "Vector.h" #include <iostream> using std::cout; using std::endl; #include <vector> using std::vector; #include <initializer_list> using std::initializer_list; int main() { vector<double> V({0,1,2,3,4,5}); initializer_list<double> I({5,4,3,2,1,0}); // --- TEST CONSTRUCTEURS --- Vector<int> v1(6); cout << v1 << endl; /* Vector<int> v2(0.1,1.1,1.2); cout << v2 << endl; Vector< > v3(V); cout << v3 << endl; Vector< > v4(I); cout << v4 << endl; Vector< > v5(v3); cout << v5 << endl; // --- TEST OPERATEURS --- cout << v2[0] << ' ' << v2[1] << ' ' << v3[2] << endl; v5 = v4; cout << v5 << endl; if(v5 == v4){cout << v5 << " == " << v4 << endl;} else{cout << v5 << " != " << v4 << endl;} if(v5 != v3){cout << v5 << " != " << v4 << endl;} else{cout << v5 << " == " << v4 << endl;} */ return 0; }codice:#include "Vector.h" #include<stdexcept> #include<algorithm> #include<iterator> // *** PUBLIC *** // --- CONSTRUCTORS --- // Empty vector template<typename T> Vector<T>::Vector(size_t size) : std::vector<T>(size, 0) {} // 3D vector template<typename T> Vector<T>::Vector(T x, T y, T z) : std::vector<T>({x, y, z}) {} template<typename T> Vector<T>::Vector(const std::vector<T> & V) : std::vector<T>(V) {} template<typename T> Vector<T>::Vector(const std::initializer_list<T>& V) : std::vector<T>(V) {} template<typename T> Vector<T>::Vector(const Vector<T>& V) { if(*this != V) { *this = V; } } // --- INNER OPERATORS --- template<typename T> bool Vector<T>::operator==(const Vector<T>& V) const { bool b(true); range_exception(V, ""); for(auto i : *this) { if(*this[i] != V[i]) { b = false; break; } } return b; } template<typename T> bool Vector<T>::operator!=(const Vector<T>& V) const { range_exception(V, ""); return !(*this == V); } // --- EXTERNAL OPERATORS --- template<typename T> std::ostream& operator<<(std::ostream& out, const Vector<T>& V) { std::copy(V.begin(), V.end(), std::ostream_iterator<T>(out, " ")); return out; } // *** PRIVATE *** template<typename T> void Vector<T>::range_except(const Vector<T>& V, const std::string& s) const { if(*this.size() != V.size()) { throw std::range_error(s); } }codice:#ifndef VECTOR_H #define VECTOR_H #include <vector> #include <initializer_list> #include <iostream> #include <string> template<typename T = double> class Vector : public std::vector<T> { public: // --- CONSTRUCTORS --- Vector(size_t); Vector(T, T, T); Vector(const std::vector<T> &); Vector(const std::initializer_list<T>&); Vector(const Vector<T>&); // --- INNER OPERATORS --- bool operator==(const Vector<T>&) const; bool operator!=(const Vector<T>&) const; private: // --- METHODS --- void range_except(const Vector<T>&, const std::string&) const; }; // --- EXTERNAL OPERATORS template<typename T> std::ostream& operator<<(std::ostream&, const Vector<T>&); #endif
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