This is an Eclipse Ccl parser that cannot find characters.
You can add configuration to an already created project, but it can be painful. So just create a new C ++ project:
File> New> C ++ Project
Then:
, , " > " (, , "Makefile Project > Empty Project" ) , Linux GCC Toolchains. , ++ . "", ++ .
, Project Properties > C/++ General > Paths and Symbols > Includes > GNU ++.