Sorting a map

[ycinar]

i have 2 maps like below:

typedef std::map<std::string, ObjA> MapA;
typedef std::map<ObjA, std::string> MapB;
 
MapA mapa;
MapB mapb;

they are actually pretty same maps, just key and value are swaped.

i want to find out whether or not a value (which is string) is in the mapB like this

ObjA function (const char * value){
for (MapB::const_iterator it = _mapb.begin(); it != _mapb.end(); ++it){
 // how do i fill here.. 
 // mapb is something like this:
 // mapb <ObjA, value>
 // like how to check if it == value and return ObjA
}
}
 

Thanks in advance

[gpraghuram]

i have 2 maps like below:

typedef std::map<std::string, ObjA> MapA;
typedef std::map<ObjA, std::string> MapB;
 
MapA mapa;
MapB mapb;

they are actually pretty same maps, just key and value are swaped.

i want to find out whether or not a value (which is string) is in the mapB like this

ObjA function (const char * value){
for (MapB::const_iterator it = _mapb.begin(); it != _mapb.end(); ++it){
 // how do i fill here.. 
 // mapb is something like this:
 // mapb <ObjA, value>
 // like how to check if it == value and return ObjA
}
}
 

Thanks in advance

Check this code

ObjA check(const char * value)
{
    for (MapB::const_iterator it = mapb.begin(); it != mapb.end(); ++it)
    {
        if (strcmp((*it).second.c_str(),value) == 0)
        {
            return (*it).first;
        }
     }
}
 

Raghuram

[weaknessforcats]

strcmp is deprecated in C++. Use the string type.

ObjA check(const string&  value)
{
    for (MapB::const_iterator it = mapb.begin(); it != mapb.end(); ++it)
    {
        if ((*it).second == value)
        {
            return (*it).first;
        }
    }
}
 

There should be no C strings in a C++ program.