Function unload_proj_library

src/proj_loader.cpp:877–918

unloads the PROJ library and sets all associated function pointers to nullptr.

/// unloads the PROJ library and sets all associated function pointers to nullptr.
void unload_proj_library() {
  if (proj_lib_handle) {  // Check whether lib_handle is valid
    FREE_LIBRARY(proj_lib_handle);  // Unload library
    proj_lib_handle = nullptr;      // Set handle to nullptr
  }

  // Set function pointer to nullptr
  proj_as_wkt_ptr = nullptr;
  proj_as_proj_string_ptr = nullptr;
  proj_as_projjson_ptr = nullptr;
  proj_get_source_crs_ptr = nullptr;
  proj_get_target_crs_ptr = nullptr;
  proj_destroy_ptr = nullptr;
  proj_context_create_ptr = nullptr;
  proj_context_destroy_ptr = nullptr;
  proj_get_id_code_ptr = nullptr;
  proj_get_ellipsoid_ptr = nullptr;
  proj_ellipsoid_get_parameters_ptr = nullptr;
  proj_crs_get_datum_ensemble_ptr = nullptr;
  proj_get_name_ptr = nullptr;
  proj_datum_ensemble_get_member_count_ptr = nullptr;
  proj_datum_ensemble_get_accuracy_ptr = nullptr;
  proj_datum_ensemble_get_member_ptr = nullptr;
  proj_crs_get_datum_ptr = nullptr;
  proj_crs_get_coordinate_system_ptr = nullptr;
  proj_cs_get_type_ptr = nullptr;
  proj_cs_get_axis_count_ptr = nullptr;
  proj_cs_get_axis_info_ptr = nullptr;
  proj_create_ptr = nullptr;
  proj_create_argv_ptr = nullptr;
  proj_create_crs_to_crs_ptr = nullptr;
  proj_create_crs_to_crs_from_pj_ptr = nullptr;
  proj_create_from_wkt_ptr = nullptr;
  proj_context_errno_ptr = nullptr;
  proj_context_errno_string_ptr = nullptr;
  proj_coord_ptr = nullptr;
  proj_trans_ptr = nullptr;
  proj_get_type_ptr = nullptr;
  proj_is_crs_ptr = nullptr;
  proj_info_ptr = nullptr;
  proj_log_func_ptr = nullptr;
}

/// User-specific error handler for PROJ errors and warnings
extern "C" void myCustomProjErrorHandler(void* app_data, int level, const char* msg) {