How to Effectively Initialize a Static `std::map` in C ?

Initializing Static std::map in C

When working with static maps in C , one may wonder about the proper method for initialization. This question delves into the available options for initializing a static map effectively.

C 11 Initializer List

One approach is to utilize C 11 initializer lists. These lists enable the specification of initial values within curly braces, preserving the order of insertion. The map automatically sorts elements based on their keys.

#include <map>

using namespace std;

map<int, char> m = {{1, 'a'}, {3, 'b'}, {5, 'c'}, {7, 'd'}};

Boost.Assign Library

Alternatively, you can employ the Boost.Assign library, which provides the map_list_of macro. This macro facilitates the initialization of maps with key-value pairs in a concise syntax:

#include <map>
#include "boost/assign.hpp"

using namespace std;
using namespace boost::assign;

map<int, char> m = map_list_of(1, 'a')(3, 'b')(5, 'c')(7, 'd');

By leveraging the initializer list or Boost.Assign library, you can effortlessly initialize static maps in C , creating a convenient and efficient approach.

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