Hi,
> How does putting your own header at the top (vs. ~the bottom) help ensure
> "a header file always includes all symbols it requires”?
Given an incomplete header
// foo.hpp
std::string f();
// foo.cpp
#include “foo.hpp”
#include <string>
std::string f() { return {}; }
I get
% clang++ -fsyntax-only foo.cpp --std=c++11
In file included from foo.cpp:1:
./foo.hpp:1:1: error: use of undeclared identifier 'std'
std::string f();
^
1 error generated.
Swapping the include order makes this pass as `#include` is just textual
replacement, and the `#include <string>` in `foo.cpp` would declare the symbol
used in `foo.hpp`.
Cheers,
Benjamin
