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c++operators
mclaassen
mclaassen

Reputation: 5138

C++ What is the % operator doing here?

I recently encountered code similar to this:

std::string myString = "test";
boost::format fmt("%s");

fmt % myString;

What is the (second) % operator doing here?

EDIT:

I understand the end result, but I could not find a definition of how the % operator can be used like this.

Can someone provide an example that explains what exactly the meaning of the % operator is here?

Upvotes: 0

Views: 120

Answers (2)

mumu
mumu

Reputation: 317

% is an overloaded operator. Click here.

Upvotes: 1

Konrad Rudolph
Konrad Rudolph

Reputation: 546015

I understand the end result, but I could not find a definition of how the % operator can be used like this.

operator % can be overloaded. Boost.Format does exactly that for its basic_format class:

template<class T>  
basic_format&   operator%(const T& x)
    { return io::detail::feed<CharT, Tr, Alloc, const T&>(*this,x); }

This member function gets invoked whenever you use the code fmt % value where fmt is of type boost::basic_format<Ch>.

Upvotes: 3

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