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So here's a snippet of my code:
struct dv_nexthop_cost_pair
{
unsigned short nexthop;
unsigned int cost;
};
map<unsigned short, vector<struct dv_nexthop_cost_pair> > dv;
I'm getting the following compiler error:
error: ISO C++ forbids declaration of `map' with no type
What's the proper way to declare this?
830
Since structures are multivalue, multitype data objects, they can be considered to form a useful tool in manipulation of quantities such as vectors, complex variables, etc. For this we define functions of the type struct, i.e., the return value of the function is a structure. The function may have arguments of type struct besides other arguments.
Vector elements are placed in contiguous storage so that they can be accessed and traversed using iterators. Map of Vectors in STL: Map of Vectors can be very efficient in designing complex data structures.
Vector elements are placed in contiguous storage so that they can be accessed and traversed using iterators. Vector of Maps in STL: Vector of maps can be used to design complex and efficient data structures.
Use Range Constructor to Initialize a Vector of Structs in C++ Alternatively, the range constructor can be utilized to initialize the vector of structs. This method is useful when one needs to create another copy of the existing vector object.
Either you forgot to #include the right headers or didn't import the std namespace. I suggest the following:
#include <map>
#include <vector>
std::map<unsigned short, std::vector<struct dv_nexthop_cost_pair> > dv;
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