Python bus = smbus.SMBus(1) equivalent in C++?

Question

I'm writing code to access an I2C sensor in C++ on a raspberry pi using wiringPiI2C.

I need to tell the pi whether to use smbus 0 or 1 (in my case, bus 1).

I know that in Python, this would be:

 bus = smbus.SMBus(1)

Do you know what the C++ equivalent of this would be?