c++ - What is the use case of declaring functions methods within bodies other functions? -

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मैं इस टुकड़े को FreeRTOS स्रोत में मिला: 

  शून्य vApplicationIdleHook (शून्य) {/ * सरल ब्लिंकी डेमो निष्क्रिय हुक का उपयोग नहीं करता - पूर्ण डेमो करता है * / #if (mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 0) {बाहरी शून्य vFullDemoIdleHook (शून्य); // * main_full.c में कार्यान्वित। * / VFullDemoIdleHook (); } #एंडिफ}

एक तरह से फ़ंक्शन / विधियाँ क्यों घोषित करेगा? लाभ क्या है? मैंने जावा में भी समान कोड देखा है।

मैं मान रहा हूं कि यह एकमात्र स्थान है प्रोजेक्ट जहां vFullDemoIdleHook का उपयोग किया जाता है, इसलिए यह स्पष्ट है & amp; केवल कुछ ही लाइनों की घोषणा और फ़ंक्शन को कॉल करने के लिए संक्षिप्त।

घोषणा कहीं और लगाने का क्या फायदा होगा? वैकल्पिक पर विचार करें ... ऐसा शायद संभव है कि आप क्या देख रहे हैं: 

  / * सरल ब्लिंकी डेमो निष्क्रिय हुक का उपयोग नहीं करता - पूर्ण डेमो करता है * / #if (mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 0) बाहरी शून्य vFullDemoIdleHook (शून्य); #endif void vApplicationIdleHook (शून्य) {/ * सरल ब्लिन्की डेमो निष्क्रिय हुक का उपयोग नहीं करता है - पूर्ण डेमो करता है * / #if (mainCREATE_SIMPLE_BLINKY_DEMO_ONLY == 0) {// * main_full.c में कार्यान्वित * / VFullDemoIdleHook (); } #endif}

मुझे इसका कोई फायदा नहीं है


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