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From: Hyman Rosen <hyrosen@mail.com>
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Subject: Re: why learn C?
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Date: Thu, 12 Apr 2007 16:24:41 GMT
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Date: 2007-04-12T16:24:41+00:00
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kevin cline wrote:
> Preprocessor macros are quite out of fashion for C++ programming.

Unfortunately so. They're good for quite a bit of things,
especially when you want to code a little "database" table
of properties to be "queried" for the implementation.

#define QuotesTableData(IMPL) \
	IMPL(stock, "Security Name", string) \
	IMPL(date, "Quote Date", time_t) \
	IMPL(bid, "Bid Price", double) \
	IMPL(ask, "Ask Price", double)

struct QuotesTable {
	#define QuotesEnumImpl(name, title, type) name,
	enum { QuotesTableData(QuotesEnumImpl), N };
	#define QuotesMembersImpl(name, title, type) type m_##name;
	QuotesTableData(QuotesMembersImpl)
	#define QuotesPropertiesImpl(name, title, type) \
		type get_##name() const { return m_##name; } \
		void set_##name(const type &v) { m_##name = v; } \
		string title_##name() const { return title; }
	QuotesTableData(QuotesPropertiesImpl)
};