[ALACPP] const char* NULL to std::string api

[Gavin Doughtie <gavin@xxxxxxxxxxxx>]

So an interesting puzzle came up at work today.

Say you have an API like so:

void doFoo(const char* param)
{
	if (NULL != param) {
		// do something
	}
}

Great. Now say you want to be modern and write the api like so:

void doFoo(const std::string& param)
{
}

Now imagine that somebody calls you with a NULL const char* param. std::string tries to implicitly convert that NULL pointer to a std::string,
and, if you are lucky and your compiler isn't a leftover from the tech boom like it might be at certain entertainment companies, the string constructor
throws a logic_error.

There is no way to guard against this except by including a const char* implementation of your interface which does the appropriate checks before forwarding to the std::string 
implementation.

The best I've come up with so far is some nasty boost::preprocessor macro to write the parellel implementation for you. Does anybody have a better idea?
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