[Boost-users] [Boost.Test] What's the best way to make custom assertions?

Subject: [Boost-users] [Boost.Test] What's the best way to make custom assertions?
From: Richard (legalize+jeeves_at_[hidden])
Date: 2012-10-23 12:20:01

[Please do not mail me a copy of your followup]

I want to make custom assertion methods that report the failure
location as the place where the custom assertion is invoked, not the
location where the BOOST_REQUIRE_xxx macros are used in the
implementation of the custom assertion.

In my own code, when I wanted to do report the point of invocation
instead of the point of implementation, I implemented my code along
the lines of

void report(char const* file, int line)
{
// ...
// output a message using line and file
// ...
}

#define REPORT() report(__FILE__, __LINE__)

void code()
{
        REPORT();  // report something interesting here
}

When I look at how the assertion macros are implemented in Boost.Test,
it seems that __FILE__ and __LINE__ are substituted down pretty far in
the macro invocation chain.  This means that if I want to write my own
custom assertion that reports messages at the point of invocation and
not at the point of implementation, I have to call these very low-level 
macro facilities and duplicate a bunch of stuff that's in Boost.Test.

One thing I don't want to do is make a gigantic multi-line macro for
my custom assertion.  I really don't like using macros for things that
could be done with functions and a custom assertion, IMO, falls into
that category.

Is there a clean way of implementing a custom assertion in the manner
I've described without replicating a bunch of the intermediate layers
of Boost.Test's macros?

Gennady, if you're reading this and there isn't a clean way of doing
what I'd like, are you willing to accept a refactoring changeset that
promotes __FILE__ and __LINE__ arguments higher in the macro call chain?
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