Re: assignment/initialization of container - map
Thomas Tutone wrote:
xuatla wrote:
I want to define a map:
std::map<string, int> myMap;
e.g., the score of students. Then I can assign the value as follows:
myMap["stud1"] = 90;
myMap["stud2"] = 60;
...
My question now is: can I assign the name of many students in one line?
e.g., for array we have the following way:
int myArray[] = { 1, 3, 4, 5 };
Do we have similar way for map?
No.
There are several similar but not identical ways for std::map. See the
other responses in this thread for initializing from an array, and also
consider a helper class that uses method chaining (see the FAQ for more
on that):
template<class K, class V>
class MapInitializer
{
typedef std::map<K,V> Map;
Map m_;
public:
operator Map() const { return m_; }
MapInitializer& Add( const K& k, const V& v )
{
m_[k] = v;
return *this;
}
};
const std::map<int,std::string> msgMap
= MapInitializer<int,std::string>()
.Add( 1, "Msg 1" )
.Add( 2, "Msg 2" )
.Add( 42, "Msg 3" );
Cheers! --M
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