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

Initializing a Static Map in C

In C , initializing a static std::map presents a unique challenge. There is no straightforward method like using an initializer list or a static function. However, there are several approaches that offer alternative solutions.

Using C 11 Initializer List

C 11 introduces an initializer list syntax that can be utilized to initialize the map. The elements within curly braces are enclosed in pairs of curly braces, with each pair representing a key-value pair. The order of initialization is irrelevant as the map automatically sorts the elements based on their keys.

#include <map>

using namespace std;

static map<int, int> m = {{1, 2}, {3, 4}, {5, 6}};

Using Boost.Assign

Boost.Assign is a library that provides convenient macros for initializing maps and other data structures. It offers a concise syntax for specifying key-value pairs within a map.

#include <boost/assign.hpp>

using namespace std;
using namespace boost::assign;

static map<int, int> m = map_list_of(1, 2)(3, 4)(5, 6);

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