Why the underscore

Created Tue, 08 Mar 2016 03:48:45 +0000 by FredCailloux

FredCailloux

Tue, 08 Mar 2016 03:48:45 +0000

Hello Majenko, In my previous question "re#define before or after #include" you show a piece of code example to explain some strategy to pass an object DSPI in a class.

class foo {
    private:
        DSPI *_spi;
    public:
        foo(DSPI &spi) : _spi(&spi) {}
        foo(DSPI *spi) : _spi(spi) {}
        void begin() {
            _spi->begin();
        }
};

DSPI2 spi;
foo MyFoo(spi);

In here you show the line DSPI *_spi: Can you explain quickly why the underscore ? Would it make a difference if the line was DSPI *spi; or DSPI *aspi; ? Is the underscore part of the variable name or does it have a specific significance ?

majenko

Tue, 08 Mar 2016 08:45:04 +0000

It's purely a convention on my part. I name my class member variables in that way so I can tell them apart from local or global variables at a glance.

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