g++ -o test test.cpp
test.cpp: In member function ‘int Test::getAddVal() const’:
test.cpp:12: error: passing ‘const std::map<int, std::list<int, std::allocator<int> >, std::less<int>, 
std::allocator<std::pair<const int, std::list<int, std::allocator<int> > > > >’ as ‘this’ argument of 
‘_Tp& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const _Key&) [with _Key = int, _Tp = std::list<int, std::allocator<int> >, _Compare = 
std::less<int>, _Alloc = std::allocator<std::pair<const int, std::list<int, std::allocator<int> > > >]’ discards qualifiers

Wenn ich getAddVal() ohne const schreibe dann funktionierst. Weiss jemand wieso das so ist? Weil eigentlich verändert <list>.begin() ja nichts.

#include <iostream>
#include <list>
#include <map>

class Test {
public:
	Test() { 
		ml[0].push_back(3);
		ml[0].push_back(5);	
	};
	int getAddVal() const {
		std::list<int>::const_iterator it = ml[0].begin();
	};
private:
	std::map<int, std::list<int> > ml;

};

int main(){
	Test *test = new Test(); 	

	delete test;
	return 0;
}

Gruß

Gruß