Add iostream to CTL

ctl/istream.h

@@ -0,0 +1,53 @@
+// -*-mode:c++;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8-*-
+// vi: set et ft=cpp ts=4 sts=4 sw=4 fenc=utf-8 :vi
+#ifndef CTL_ISTREAM_H_
+#define CTL_ISTREAM_H_
+#include "ios.h"
+
+namespace ctl {
+
+struct string;
+
+class istream : public ios
+{
+  public:
+    istream() = delete;
+    explicit istream(FILE*);
+    virtual ~istream();
+
+    istream& operator>>(char&);
+    istream& operator>>(int&);
+    istream& operator>>(long&);
+    istream& operator>>(double&);
+    istream& operator>>(bool&);
+    istream& operator>>(string&);
+    istream& operator>>(istream& (*)(istream&));
+
+    int get();
+    istream& get(char&);
+    istream& getline(char*, streamsize);
+    istream& getline(char*, streamsize, char);
+    istream& read(char*, streamsize);
+    streamsize gcount() const;
+
+    int peek();
+    istream& ignore(streamsize = 1, int = -1);
+
+    istream(istream&&) noexcept;
+    istream& operator=(istream&&) noexcept;
+
+  private:
+    streamsize gcount_;
+
+    istream(const istream&) = delete;
+    istream& operator=(const istream&) = delete;
+};
+
+extern istream cin;
+
+istream&
+ws(istream& is);
+
+} // namespace ctl
+
+#endif // CTL_ISTREAM_H_