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I'm reading through some smart contracts and I noticed functions being called in the head of the constructor function, like MarginAdmin() in the following example. 

constructor(address vault, address proxy)
    public
    MarginAdmin()
{
    state = MarginState.State({
        VAULT: vault,
        PROXY: proxy
    });
}

In this case, MarginAdmin is another solidity contract that is being imported into this file. What does this mean when a function gets called like this in the head of constructor function?

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I assume the contract in question inherits from MarginAdmin (e.g. contract Foo is MarginAdmin).

MarginAdmin() is how the constructor for MarginAdmin (the "base class") is invoked.

See https://solidity.readthedocs.io/en/v0.4.24/contracts.html#inheritance for more details about contract inheritance.

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  • That's correct. The only thing which bothers me in this case is why to call constructor without parameters ? It would be called anyway...Isn't it ?I think you can skip it and don't call MarginAdmin() at all. – Rob Magier Jul 12 '18 at 20:00
  • Yes, I believe there's no need to explicitly invoke a parameterless constructor in the base class. – smarx Jul 12 '18 at 20:05
  • That seems like an unrelated question. Please create a new question to ask it. – smarx Jul 12 '18 at 21:49

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