std::istream::ignore is inconsistent with regards to eof()

test.cc

#include <iostream>
#include <sstream>
#include <fstream>
using namespace std;

int main(int argc, char** argv) {
    string s("ab");
    {
        istringstream stream(s);
        stream.ignore(1); stream.ignore(1);
        cout << stream.good() << endl; // 1
    }

    {
        istringstream stream(s);
        stream.ignore(2);
        cout << stream.good() << endl; // 0
    }

    {
        ifstream stream("test.cc");
        stream.seekg(0, ios_base::end);
        size_t size = stream.tellg();
        stream.seekg(0, ios_base::beg);
        for (size_t i = 0; i < size; ++i) {
            stream.ignore();
        }
        cout << stream.good() << endl; // 1
    }

    {
        ifstream stream("test.cc");
        stream.seekg(0, ios_base::end);
        size_t size = stream.tellg();
        stream.seekg(0, ios_base::beg);
        stream.ignore(size);
        cout << stream.good() << endl; // 0
    }
}

$ g++ --version && g++ test.cc && ./a.out 
g++ (Ubuntu 5.2.1-22ubuntu2) 5.2.1 20151010
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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$ clang++ --version && clang++ test.cc && ./a.out 
Ubuntu clang version 3.6.2-1 (tags/RELEASE_362/final) (based on LLVM 3.6.2)
Target: x86_64-pc-linux-gnu
Thread model: posix
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