c++ - Reading from ifstream won't read whitespace

Question

I'm implementing a custom lexer in C++ and when attempting to read in whitespace, the ifstream won't read it out. I'm reading character by character using >>, and all the whitespace is gone. Is there any way to make the ifstream keep all the whitespace and read it out to me? I know that when reading whole strings, the read will stop at whitespace, but I was hoping that by reading character by character, I would avoid this behaviour.

Attempted: .get(), recommended by many answers, but it has the same effect as std::noskipws, that is, I get all the spaces now, but not the new-line character that I need to lex some constructs.

Here's the offending code (extended comments truncated)

while(input >> current) {
    always_next_struct val = always_next_struct(next);
    if (current == L' ' || current == L'
' || current == L'' || current == L'
') {
        continue;
    }
    if (current == L'/') {
        input >> current;
        if (current == L'/') {
            // explicitly empty while loop
            while(input.get(current) && current != L'
');
            continue;
        }

I'm breaking on the while line and looking at every value of current as it comes in, and or are definitely not among them- the input just skips to the next line in the input file.

Answer 1

There is a manipulator to disable the whitespace skipping behavior:

stream >> std::noskipws;