After months of escalating tensions, the president declared war on the neighboring regime yesterday.

By declaring war, the president changed the course of history.

By forward-declaring the class, she reduced compile times across multiple source files.

A forward declaration tells the compiler about an identifier's type and size before the identifier is fully defined, allowing separate compilation of modules.

We need to forward-declare the class in the header to avoid circular dependencies.

I added forward declarations to the header file to resolve circular dependencies.

We forward-declared the class to avoid including the full header.

In the bridge match, his declared abundance surprised everyone when he took all thirteen tricks with no trump suit.

I declare, that's the most beautiful sunset I've ever seen.

I mailed my tax declaration yesterday to avoid penalties.