while(!__HAL_ADC_GET_FLAG(&hadc1, ADC_ISR_EOC))

This is an incomplete code snippet from the HAL library of STM32 microcontrollers.

`__HAL_ADC_GET_FLAG()` is a macro defined in the HAL library that checks the status flag of the specified ADC peripheral. The `while` loop is used to wait until the flag is set before executing the next line of code.

The complete code would look something like this:

while(!__HAL_ADC_GET_FLAG(&hadc1, ADC_FLAG_EOC)); // Wait until end of conversion flag is set
uint16_t adc_value = HAL_ADC_GetValue(&hadc1); // Get the converted ADC value

Here, `&hadc1` is the handle to the ADC peripheral being used. `ADC_FLAG_EOC` is the flag that is set when the ADC conversion is complete. `HAL_ADC_GetValue()` is a function that retrieves the converted value from the ADC data register.