unmangler is a tool to take those ugly type names that typeid outputs (like St6vectorIS_ISt4pairIiPcESaIS2_EESaIS4_EE) and turns it into color-coded type names.

See, c++filt also decodes type names, but the output looks kind of like this:

That's more readable...a little...

With unmangler, that turns into:

That's better!

You need Fbuild installed FROM GIT. Just run:

$ fbuild

$ fbuild install

Just run build/unmangler with the mangled name, and it will output a nice, color-coded representation, like:

build/unmangler St6vectorIS_ISt4pairIiPcESaIS2_EESaIS4_EE