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/************************************************************/
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/* */
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/* Predefined char stream: Input from (c++) stream. */
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/* */
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/* By Hubert Holin (Hubert.Holin@Bigfoot.com), 1998. */
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/* */
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/* This is completely free stuff, do whatever you want with */
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/* it (but then, I will take no responsibility for whatever */
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/* may happen if you do either... caveat emptor!). */
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/* */
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/************************************************************/
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#ifndef _DLG_STREAM_INPUT_H
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#define _DLG_STREAM_INPUT_H
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#include "pccts_istream.h"
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PCCTS_NAMESPACE_STD
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#ifndef DLGX_H
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#include "DLexerBase.h"
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#endif
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// NOTES: The semantics of the copy constructor
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// and the affectation operator may be unwarranted...
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// and the stream may not be reset.
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//
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// It would have been so much nicer for nextChar()
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// to throw (of for the DLGInputStream to change status)
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// upon hitting EOF than to return an "int"...
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template <
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class E,
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class T = ::std::char_traits<E>
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>
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class DLG_stream_input : public DLGInputStream
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{
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public:
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DLG_stream_input(::std::basic_istream<E,T> * p_input_stream)
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: input(p_input_stream)
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{
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// nothing to do!
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};
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DLG_stream_input(const DLG_stream_input & a_recopier)
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: input(a_recopier.input)
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{
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// nothing to do!
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};
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virtual ~DLG_stream_input()
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{
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this->purge(); // bloody templarized lookup...
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};
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DLG_stream_input operator = (const DLG_stream_input & a_affecter)
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{
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if (this != &a_affecter)
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{
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input = a_affecter.input;
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}
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return(*this);
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};
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virtual int nextChar()
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{
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E extracted_stuff;
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input->get(extracted_stuff);
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if (*input)
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{
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return(int(extracted_stuff));
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}
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else
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{
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return(EOF);
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}
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};
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protected:
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::std::basic_istream<E,T> * input;
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private:
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void purge()
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{
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// nothing to do!
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};
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};
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#endif /* _DLG_STREAM_INPUT_H */
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