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I have problem with C knowledge!

Hello everyone! I am learning with nrf52840 MCU and SDK version 13. When I read the example. I see one line:

SVCALL(SD_BLE_GAP_CONNECT, uint32_t, sd_ble_gap_connect(ble_gap_addr_t const *p_peer_addr, ble_gap_scan_params_t const *p_scan_params, ble_gap_conn_params_t const *p_conn_params, uint8_t conn_cfg_tag));

I have a question: Which does knowledge of C was used in above code? ( It is "preprocessor directives", isn't it? ). can anyone give me a link to learn this knowledge? Thanks!

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