visual studio code is not autocompleting std:: in c++ on ubuntu - c++

Question

The behaviour i am looking for is when i type
using std::co then i expect it to autocomplete to cout (or at least suggest)
using std::vect then i expect it to autocomplete to vector
I have it set up on my laptop and it works perfectly fine ... it is just on my main vm that it does not. Sadly after a few hours of tinkering and googling not figured it out.
installed c++, build essentials, clang-format-3.8
vscode, c++ extention and c++ autocomplete.
noticed the one that worked had this added to the c_cpp_properties (not that i expected clang to help but was out of other options.)
,
"clang_format" : {
"style" : "file",
"fallback-style" : "LLVM",
"sort-includes" : false
}
I think it is probably a package difference but cannot see where that difference is. I also cannot find the difference in vscode config if there is one.
It also doesn't autocomplete for any included headers.
Infact i do not get autocompletion for using or include either.
In the one that doesnt work any autocompletion options i have shows the path into /usr/include/c++/5 wheras on the system where it does work i do not get any path info, only an abc icon and the command i want.

Answer 1

Edit: actually this does not fix std::<blah> autocomplete
Appears not to be working atm.
The fix:
File=>preferences->Workspace settings
then in user overrides this:
{
"C_Cpp.autocomplete": "Disabled"
}
if you scroll to bottom of the default settings you will see
// Controls auto completion for C/C++ code.
'Default' uses an experimental recursive directory tag parser (as of right now).
'Disabled' uses the word based completion provided by Visual Studio Code.
"C_Cpp.autocomplete": "Default"
Found this out when i saw this issue on github:
https://github.com/Microsoft/vscode-cpptools/issues/189