CathLibCpp 
CathLibCpp is hosted by Alexander Thoukydides
As his site no longer responds, I make available the documents that are his property.
The Alexander ToolBox C++ library 32 bits version (buit with DDE26/OSLIB32/CathLibCpp32
AlexLib Download
Miles Sabin adapted SGI's STL to work with CFront (not simple). it works very well, even if it dates from the last century.
The examples provided with 26-bit source fully recompiled with DDE and functional.
For the anecdote, the announcement for the 32-bit version of CathLibCpp made jointly with Alexander, it was on his site. I wanted to rebuild PsiFs to use with my ARMX6, it works. A large part of the program is made in C++ with CathLibCpp
To come the library usable with the DDE.