The source program:


    #include <map>
    #include <algorithm>
    #include <cmath>

    const int values[] = { 1,2,3,4,5 };
    const int NVALS = sizeof values / sizeof (int);

    int main()
    {
        using namespace std;

        typedef map<int, double> valmap;

        valmap m;

        for (int i = 0; i < NVALS; i++)
            m.insert(make_pair(values[i], pow(values[i], .5)));

        valmap::iterator it = 100;              // error
        valmap::iterator it2(100);              // error
        m.insert(it);                           // error

        return 0;
    }


First, an unfiltered run using the Comeau 4.3.0.1 compiler:


    d:\src\cl\demo>como rtmap.cpp
    Comeau C/C++ 4.3.0.1 (Aug 21 2002 15:45:32) for MS_WINDOWS_x86
    Copyright 1988-2002 Comeau Computing.  All rights reserved.
    MODE:non-strict warnings microsoft C++

    "rtmap.cpp", line 19: error: no suitable constructor exists to convert from
              "int" to "std::_Rb_tree_iterator<std::_Rb_tree<std::map<int, double,
              std::less<int>, std::allocator<double>>::key_type, std::map<int,
              double, std::less<int>, std::allocator<double>>::value_type,
              std::_Select1st<std::map<int, double, std::less<int>,
              std::allocator<double>>::value_type>, std::map<int, double,
              std::less<int>, std::allocator<double>>::key_compare,
              std::allocator<double>>::value_type, std::_Rb_tree<std::map<int,
              double, std::less<int>, std::allocator<double>>::key_type,
              std::map<int, double, std::less<int>,
              std::allocator<double>>::value_type, std::_Select1st<std::map<int,
              double, std::less<int>, std::allocator<double>>::value_type>,
              std::map<int, double, std::less<int>,
              std::allocator<double>>::key_compare,
              std::allocator<double>>::reference, std::_Rb_tree<std::map<int,
              double, std::less<int>, std::allocator<double>>::key_type,
              std::map<int, double, std::less<int>,
              std::allocator<double>>::value_type, std::_Select1st<std::map<int,
              double, std::less<int>, std::allocator<double>>::value_type>,
              std::map<int, double, std::less<int>,
              std::allocator<double>>::key_compare,
              std::allocator<double>>::pointer>"
          valmap::iterator it = 100;              // error
                                ^

    "rtmap.cpp", line 20: error: no instance of constructor
              "std::_Rb_tree_iterator<_Value, _Ref, _Ptr>::_Rb_tree_iterator [with
              _Value=std::_Rb_tree<std::map<int, double, std::less<int>,
              std::allocator<double>>::key_type, std::map<int, double,
              std::less<int>, std::allocator<double>>::value_type,
              std::_Select1st<std::map<int, double, std::less<int>,
              std::allocator<double>>::value_type>, std::map<int, double,
              std::less<int>, std::allocator<double>>::key_compare,
              std::allocator<double>>::value_type,
              _Ref=std::_Rb_tree<std::map<int, double, std::less<int>,
              std::allocator<double>>::key_type, std::map<int, double,
              std::less<int>, std::allocator<double>>::value_type,
              std::_Select1st<std::map<int, double, std::less<int>,
              std::allocator<double>>::value_type>, std::map<int, double,
              std::less<int>, std::allocator<double>>::key_compare,
              std::allocator<double>>::reference, _Ptr=std::_Rb_tree<std::map<int,
              double, std::less<int>, std::allocator<double>>::key_type,
              std::map<int, double, std::less<int>,
              std::allocator<double>>::value_type, std::_Select1st<std::map<int,
              double, std::less<int>, std::allocator<double>>::value_type>,
              std::map<int, double, std::less<int>,
              std::allocator<double>>::key_compare,
              std::allocator<double>>::pointer]" matches the argument list
                argument types are: (int)
          valmap::iterator it2(100);              // error
                               ^

    "rtmap.cpp", line 21: error: no instance of overloaded function
              "std::map<_Key, _Tp, _Compare, _Alloc>::insert [with _Key=int,
              _Tp=double, _Compare=std::less<int>, _Alloc=std::allocator<double>]"
              matches the argument list
                argument types are: (std::map<int, double, std::less<int>,
                          std::allocator<double>>::iterator)
                object type is: valmap
          m.insert(it);                           // error
            ^

    3 errors detected in the compilation of "rtmap.cpp".


And a filtered run using como's --stlfilt option:


    d:\src\cl\demo>como --stlfilt rtmap.cpp
    Comeau C/C++ 4.3.0.1 (Aug 21 2002 15:45:32) for MS_WINDOWS_x86
    Copyright 1988-2002 Comeau Computing.  All rights reserved.
    BD Software STL Message Decryptor (Release 1.20 for Comeau C++)
    MODE:non-strict warnings microsoft C++

    rtmap.cpp(19): error: no suitable constructor exists to convert from "int" to
      "map<int,double>::iter"
          valmap::iterator it = 100;              // error
                                ^

    rtmap.cpp(20): error: no instance of constructor "map<int,double>::iter"
      matches the argument list
        argument types are: (int)
          valmap::iterator it2(100);              // error
                               ^

    rtmap.cpp(21): error: no instance of overloaded function
      "map<int,double>::insert" matches the argument list
        argument types are: (map<int,double>::iter)
        object type is: valmap
          m.insert(it);                           // error
            ^

    3 errors detected in the compilation of "rtmap.cpp".