Convert text to pdf format C++

You can use the Adobe PDF Library:

https://opensource.adobe.com/dc-acrobat-sdk-docs/ 

I am not 100% sure if you meant by writing a program to actually develop a whole software from scratch in C++  that will interact with Adobe Acrobat in such way with no use of JavaScript at all,

OR , 

if you meant to devlop some scripts in C++ that will interface with  the Acrobat JavaScript APIs in order to be able  to customize an action that can convert a text document to a PDF.

There are libraries that can aid developers to do their own plugins and  interface them with  Acrobat JavaScript to extend some functionalities and customize other actions.

See if the link below is a good starting point:

• https://help.adobe.com/en_US/acrobat/acrobat_dc_sdk/2015/HTMLHelp/Acro12_MasterBook/API_References_SectionPage/API_References/Acrobat_API_Reference/index.html