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Extend usage of std::function on all the platforms where it's available #993

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2 changes: 1 addition & 1 deletion src/PubSubClient.h
Original file line number Diff line number Diff line change
Expand Up @@ -76,7 +76,7 @@
// Maximum size of fixed header and variable length size header
#define MQTT_MAX_HEADER_SIZE 5

#if defined(ESP8266) || defined(ESP32)
#if __has_include(<functional>)
#include <functional>
#define MQTT_CALLBACK_SIGNATURE std::function<void(char*, uint8_t*, unsigned int)> callback
#else
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