Use hash map for rcl_params_t and rcl_node_params_s #808
Description
Feature request
Feature description
Currently, find_node and find_parameter use a loop find with an array to get an item which costs O(n), it's better to use a hash map instead of the array to store data so that it will costs O(1).
Implementation considerations
typedef struct rcl_node_params_s
{
rcutils_hash_map_t params; /// char* : rcl_variant_t*
} rcl_node_params_s;
typedef struct rcl_params_s
{
rcutils_hash_map_t node_params; /// char* : rcl_node_params_t*
rcutils_allocator_t allocator; ///< Allocator used
} rcl_params_t;
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