The include is correct. First, includes either need to be wrapped in angle brackets (for files included from the include path passed to the compiler) or quotes

The include is correct. First, includes either need to be wrapped in angle brackets (for files included from the include path passed to the compiler) or quotes (for paths relative to the current file). Second, the whole standard library would be huge to pull in, so it is split into many headers, even for symbols in the top level of the std namespace.