Compile error.

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  • Hill
    #1

    Compile error.

    This is an simple map, just an exercise. Who can help me fix this
    compile issue?Thanks in advance.
    #include <string>
    #include <vector>
    #include <iostream>
    using std::vector;
    using std::string;
    using std::cout;
    using std::endl;

    template<typena me T>
    class Map{
    template<typena me U>
    struct Pair{
    string name;
    U val;
    Pair(string n ="", U v):name(n),val( v){}
    };
    vector<Pair<T vec;
    Map(const Map&);
    Map& operator=(const Map&);
    typedef vector<Pair<T:: const_iterator CIT;
    typedef vector<Pair<T:: iterator IT;
    public:
    Map(){}
    double& operator[](const string&);
    void print_all()cons t;
    };
    template<typena me T>
    T& Map<T>::operato r[](const string& name)
    {
    IT it = vec.begin();
    IT end = vec.end();
    for(; it != end; ++it){
    if(it->name == name) return it->val;
    }
    vec.push_back(P air<T>(name,T() ));
    return vec.back().val;
    }
    template<typena me T>
    void Map<T>::print_a ll()const
    {
    for(CIT p = vec.begin(); p != vec.end();++p){
    cout << p->name << ": " << p->val << endl;
    }
    }
    int main()
    {
    Map<intm;
    m["zhu"] = 100;
    m["li"] = 200;
    m.print_all();
    }


    -*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
    Compilation started at Sat Nov 15 21:42:28

    g++ 13.8.cpp
    13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
    std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
    13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
    with no type
    13.8.cpp:20: error: expected `;' before "CIT"
    13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
    std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
    13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
    type
    13.8.cpp:21: error: expected `;' before "IT"
    13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
    std::string&)' does not match any in class `Map<T>'
    13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
    std::string&)
    13.8.cpp:29: error: template definition of non-template `T&
    Map<T>::operato r[](const std::string&)'
    13.8.cpp: In member function `T& Map<T>::operato r[](const
    std::string&)':
    13.8.cpp:30: error: `IT' was not declared in this scope
    13.8.cpp:30: error: expected `;' before "it"
    13.8.cpp:31: error: expected `;' before "end"
    13.8.cpp:32: error: `it' was not declared in this scope
    13.8.cpp:32: error: `end' was not declared in this scope
    13.8.cpp: In member function `void Map<T>::print_a ll() const':
    13.8.cpp:41: error: `CIT' was not declared in this scope
    13.8.cpp:41: error: expected `;' before "p"
    13.8.cpp:41: error: `p' was not declared in this scope

    Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28






    Tags: None
    • Barry
      #2
      Re: Compile error.

      On 11ÔÂ15ÈÕ, ÏÂÎç9ʱ43·Ö, Hill <zhubi...@gmail .com>wrote:
      This is an simple map, just an exercise. Who can help me fix this
      compile issue?Thanks in advance.
      #include <string>
      #include <vector>
      #include <iostream>
      using std::vector;
      using std::string;
      using std::cout;
      using std::endl;
      >
      template<typena me T>
      class Map{
      template<typena me U>
      struct Pair{
      string name;
      U val;
      Pair(string n ="", U v):name(n),val( v){}
      };
      vector<Pair<T vec;
      Map(const Map&);
      Map& operator=(const Map&);
      typedef vector<Pair<T:: const_iterator CIT;
      typedef vector<Pair<T:: iterator IT;
      const_iterator is a dependent type here,
      try
      typedef typename vector<Pair<T:: const_iterator CIT;
      typedef typename vector<Pair<T:: iterator IT;
      public:
      Map(){}
      double& operator[](const string&);
      void print_all()cons t;};
      >
      template<typena me T>
      T& Map<T>::operato r[](const string& name)
      {
      IT it = vec.begin();
      IT end = vec.end();
      for(; it != end; ++it){
      if(it->name == name) return it->val;
      }
      vec.push_back(P air<T>(name,T() ));
      return vec.back().val; }
      >
      template<typena me T>
      void Map<T>::print_a ll()const
      {
      for(CIT p = vec.begin(); p != vec.end();++p){
      cout << p->name << ": " << p->val << endl;
      }}
      >
      int main()
      {
      Map<intm;
      m["zhu"] = 100;
      m["li"] = 200;
      m.print_all();
      >
      }
      >
      -*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
      Compilation started at Sat Nov 15 21:42:28
      >
      g++ 13.8.cpp
      13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
      std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
      13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
      with no type
      13.8.cpp:20: error: expected `;' before "CIT"
      13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
      std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
      13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
      type
      13.8.cpp:21: error: expected `;' before "IT"
      13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
      std::string&)' does not match any in class `Map<T>'
      13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
      std::string&)
      13.8.cpp:29: error: template definition of non-template `T&
      Map<T>::operato r[](const std::string&)'
      13.8.cpp: In member function `T& Map<T>::operato r[](const
      std::string&)':
      13.8.cpp:30: error: `IT' was not declared in this scope
      13.8.cpp:30: error: expected `;' before "it"
      13.8.cpp:31: error: expected `;' before "end"
      13.8.cpp:32: error: `it' was not declared in this scope
      13.8.cpp:32: error: `end' was not declared in this scope
      13.8.cpp: In member function `void Map<T>::print_a ll() const':
      13.8.cpp:41: error: `CIT' was not declared in this scope
      13.8.cpp:41: error: expected `;' before "p"
      13.8.cpp:41: error: `p' was not declared in this scope
      >
      Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28

        Comment

        • Hill
          #3
          Re: Compile error.

          On 11ÔÂ15ÈÕ, ÏÂÎç10ʱ54·Ö, Barry <dhb2...@gmail. comwrote:
          On 11ÔÂ15ÈÕ, ÏÂÎç9ʱ43·Ö, Hill <zhubi...@gmail .comwrote:
          >
          >
          >
          This is an simple map, just an exercise. Who can help me fix this
          compile issue?Thanks in advance.
          #include <string>
          #include <vector>
          #include <iostream>
          using std::vector;
          using std::string;
          using std::cout;
          using std::endl;
          >
          template<typena me T>
          class Map{
          template<typena me U>
          struct Pair{
          string name;
          U val;
          Pair(string n ="", U v):name(n),val( v){}
          };
          vector<Pair<T vec;
          Map(const Map&);
          Map& operator=(const Map&);
          typedef vector<Pair<T:: const_iterator CIT;
          typedef vector<Pair<T:: iterator IT;
          >
          const_iterator is a dependent type here,
          try
          typedef typename vector<Pair<T:: const_iterator CIT;
          typedef typename vector<Pair<T:: iterator IT;
          >
          public:
          Map(){}
          double& operator[](const string&);
          void print_all()cons t;};
          >
          template<typena me T>
          T& Map<T>::operato r[](const string& name)
          {
          IT it = vec.begin();
          IT end = vec.end();
          for(; it != end; ++it){
          if(it->name == name) return it->val;
          }
          vec.push_back(P air<T>(name,T() ));
          return vec.back().val; }
          >
          template<typena me T>
          void Map<T>::print_a ll()const
          {
          for(CIT p = vec.begin(); p != vec.end();++p){
          cout << p->name << ": " << p->val << endl;
          }}
          >
          int main()
          {
          Map<intm;
          m["zhu"] = 100;
          m["li"] = 200;
          m.print_all();
          >
          }
          >
          -*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
          Compilation started at Sat Nov 15 21:42:28
          >
          g++ 13.8.cpp
          13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
          std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
          13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
          with no type
          13.8.cpp:20: error: expected `;' before "CIT"
          13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
          std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
          13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
          type
          13.8.cpp:21: error: expected `;' before "IT"
          13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
          std::string&)' does not match any in class `Map<T>'
          13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
          std::string&)
          13.8.cpp:29: error: template definition of non-template `T&
          Map<T>::operato r[](const std::string&)'
          13.8.cpp: In member function `T& Map<T>::operato r[](const
          std::string&)':
          13.8.cpp:30: error: `IT' was not declared in this scope
          13.8.cpp:30: error: expected `;' before "it"
          13.8.cpp:31: error: expected `;' before "end"
          13.8.cpp:32: error: `it' was not declared in this scope
          13.8.cpp:32: error: `end' was not declared in this scope
          13.8.cpp: In member function `void Map<T>::print_a ll() const':
          13.8.cpp:41: error: `CIT' was not declared in this scope
          13.8.cpp:41: error: expected `;' before "p"
          13.8.cpp:41: error: `p' was not declared in this scope
          >
          Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28
          >
          >
          Thanks very much.
          But now i upgrade the code to let it can hold types without default
          constructor. But caught in another error:
          #include <string>
          #include <vector>
          #include <iostream>
          using std::vector;
          using std::string;
          using std::cout;
          using std::endl;
          using std::ostream;

          template<typena me T>
          struct Aligner{
          union{
          long double long_double_;
          long long_;
          void (*simple_functi on_ptr)();
          };
          };

          template<typena me T>
          class Map{
          template<typena me U>
          struct Pair{
          string name;
          union{
          char raw_mem[sizeof(U)];
          Aligner<Udummy;
          }val;
          Pair(string n = ""):name(n) {}

          Pair& operator=(const U& v){
          new(val.raw_mem ) U(v);
          return *this;
          }
          };
          vector<Pair<T vec;
          Map(const Map&);
          Map& operator=(const Map&);
          typedef typename vector<Pair<T:: const_iterator CIT;
          typedef typename vector<Pair<T:: iterator IT;
          public:
          Map(){}
          Pair<T>& operator[](const string&);
          void print_all()cons t;
          };
          template<typena me T>
          Pair<T>& Map<T>::operato r[](const string&
          name)////////////////////////////line 46
          {
          IT it = vec.begin();
          IT end = vec.end();
          for(; it != end; ++it){
          if(it->name == name) return *it;
          }
          vec.push_back(P air<T>(name));
          return vec.back();
          }
          template<typena me T>
          void Map<T>::print_a ll()const
          {
          for(CIT p = vec.begin(); p != vec.end();++p){
          cout << p->name << ": " << *(T*)(&p->val.raw_mem[0]) << endl;
          }
          }
          struct stu{
          string name;
          string id;
          stu(string n, string i):name(n), id(i){}
          //stu(){}
          };
          ostream& operator<<(ostr eam& os, const stu& s)
          {
          return os << " Name: " << s.name << " Id: " << s.id ;
          }

          int main()
          {
          Map<stum;
          m["first"] = stu("Zhubicen", "011062");
          m.print_all();
          }

          -*- mode: compilation; default-directory: "z:/tcplex/p2_ch13/" -*-
          Compilation started at Sun Nov 16 19:33:03

          g++ 13.8.cpp
          13.8.cpp:46: error: expected constructor, destructor, or type
          conversion before '<' token

          Compilation exited abnormally with code 1 at Sun Nov 16 19:33:03









            Comment

            • mail.dsp@gmail.com
              #4
              Re: Compile error.

              On Nov 15, 6:43 pm, Hill <zhubi...@gmail .comwrote:
              This is an simple map, just an exercise. Who can help me fix this
              compile issue?Thanks in advance.
              #include <string>
              #include <vector>
              #include <iostream>
              using std::vector;
              using std::string;
              using std::cout;
              using std::endl;
              >
              template<typena me T>
              class Map{
              template<typena me U>
              struct Pair{
              string name;
              U val;
              Pair(string n ="", U v):name(n),val( v){}
              };
              vector<Pair<T vec;
              Map(const Map&);
              Map& operator=(const Map&);
              typedef vector<Pair<T:: const_iterator CIT;
              typedef vector<Pair<T:: iterator IT;
              public:
              Map(){}
              double& operator[](const string&);
              void print_all()cons t;};
              >
              template<typena me T>
              T& Map<T>::operato r[](const string& name)
              {
              IT it = vec.begin();
              IT end = vec.end();
              for(; it != end; ++it){
              if(it->name == name) return it->val;
              }
              vec.push_back(P air<T>(name,T() ));
              return vec.back().val; }
              >
              template<typena me T>
              void Map<T>::print_a ll()const
              {
              for(CIT p = vec.begin(); p != vec.end();++p){
              cout << p->name << ": " << p->val << endl;
              }}
              >
              int main()
              {
              Map<intm;
              m["zhu"] = 100;
              m["li"] = 200;
              m.print_all();
              >
              }
              >
              -*- mode: compilation; default-directory: "e:/tcplex/p2_ch13/" -*-
              Compilation started at Sat Nov 15 21:42:28
              >
              g++ 13.8.cpp
              13.8.cpp:20: error: type `std::vector<Ma p<T>::Pair<T>,
              std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
              13.8.cpp:20: error: ISO C++ forbids declaration of `const_iterator '
              with no type
              13.8.cpp:20: error: expected `;' before "CIT"
              13.8.cpp:21: error: type `std::vector<Ma p<T>::Pair<T>,
              std::allocator< Map<T>::Pair<T >' is not derived from type `Map<T>'
              13.8.cpp:21: error: ISO C++ forbids declaration of `iterator' with no
              type
              13.8.cpp:21: error: expected `;' before "IT"
              13.8.cpp:29: error: prototype for `T& Map<T>::operato r[](const
              std::string&)' does not match any in class `Map<T>'
              13.8.cpp:24: error: candidate is: double& Map<T>::operato r[](const
              std::string&)
              13.8.cpp:29: error: template definition of non-template `T&
              Map<T>::operato r[](const std::string&)'
              13.8.cpp: In member function `T& Map<T>::operato r[](const
              std::string&)':
              13.8.cpp:30: error: `IT' was not declared in this scope
              13.8.cpp:30: error: expected `;' before "it"
              13.8.cpp:31: error: expected `;' before "end"
              13.8.cpp:32: error: `it' was not declared in this scope
              13.8.cpp:32: error: `end' was not declared in this scope
              13.8.cpp: In member function `void Map<T>::print_a ll() const':
              13.8.cpp:41: error: `CIT' was not declared in this scope
              13.8.cpp:41: error: expected `;' before "p"
              13.8.cpp:41: error: `p' was not declared in this scope
              >
              Compilation exited abnormally with code 1 at Sat Nov 15 21:42:28
              In your code if type U is not specially treated than type T as well as
              it is directly dependent on type T then why did you introduce type U.
              Better to remove it.

              template<typena me T>
              class Map{
              struct Pair{
              string name;
              T val;
              Pair(string n ="", U v):name(n),val( v){}
              };
              vector<Pairvec;


              Pair(string n ="", U v)
              In this definition you're providing default argument from left side
              which is not acceptable at all according to C++.


              typedef vector<Pair<T:: const_iterator CIT;
              In this statement you're missing typename keyword. Use the following
              statement
              typedef typename vector<Pair<T:: const_iterator CIT;


              double& operator[](const string&);
              Why return type is double???

              Check all these things and your compilation error will be removed.


              --
              Daya

                Comment

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