What happened to std::assert

问题:

This answer and it's multitude of duplicates indicate that I should be using #include <c*> for the C headers that I pull from in C++ code, and that I should be calling them with std::*.

I have been doing that but I notice an exception. std::assert doesn't seem to be defined, even when I correctly #include <cassert>.

What's going on here? Is this an implementation oversight, or an actual exception?

回答1:

assert is a macro, not a function. Hence, it needs to be used with plain old assert(condition).

Here's a supporting link: http://en.cppreference.com/w/cpp/error/assert.

回答2:

assert is a macro, thus it isn't possible to restrict it to a namespace.