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Without going into the gory details I want to use a #define macro that will expand to a #include but the '#' sign is confusing the preprocessor (as it thinks I want to quote an argument.)
For example, I want to do something like this:
#define MACRO(name) #include "name##foo" And use it thus:
MACRO(Test) Which will expand to:
#include "Testfoo" The humble # sign is causing the preprocessor to barf. MinGW gives me the following error:
'#' is not followed by a macro parameter
I guess I need to escape the # sign but I don't if this is even possible.
Yes, macros are indeed evil...
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Escaping a string means to reduce ambiguity in quotes (and other characters) used in that string. For instance, when you're defining a string, you typically surround it in either double quotes or single quotes: "Hello World." But what if my string had double quotes within it? "Hello "World.""
Escape CharactersUse the backslash character to escape a single character or symbol. Only the character immediately following the backslash is escaped. Note: If you use braces to escape an individual character within a word, the character is escaped, but the word is broken into three tokens.
Escaping is a method of quoting single characters. The escape (\) preceding a character tells the shell to interpret that character literally. With certain commands and utilities, such as echo and sed, escaping a character may have the opposite effect - it can toggle on a special meaning for that character.
It is possible to insert a hash token into the preprocessed token stream. You can do it as follows:
#define MACRO(hash, name) hash include name MACRO(#,"hello") —expands to:
# include "hello" However, the standard explicitly rules out any further analysis of such line for the existence of preprocessing directives [cpp.rescan]:
The resulting completely macro-replaced preprocessing token sequence is not processed as a preprocessing directive even if it resembles one.
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As far as I remember you cannot use another preprocessor directive in define.
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