macros standard equivalent?

Hello All,

I am using the following macros;

#define str(x) # x
#define conc(x,y) x ## y

to play with strings. Does anyone know if there is an equivalent
provided by the standard library to accomplish this? Thank you,

aa

re: macros standard equivalent?

aaragon wrote:No, there isn't anything. However, to properly concatenate those
you might want to use indirection, i.e. have another set of the two
macros to help:

#define applystringize(x) # x
#define str(x) applystringize(x)
#define applyconcatenate(x,y) x ## y
#define conc(x,y) applyconcatenate(x,y)

because otherwise if you use macros like 'conc(x, str(x))', it
won't do it without this extra indirection stuff.

V
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re: macros standard equivalent?

aaragon wrote:
Those are "stringerization" and "token pasting". They are one of a few
reasons to use macros, and nothing below the macro layer, in the layer of
C++ keywords, can do anything like them. They change the text that the see.
So

conc(in,t) x = 42;

gets compiled as

int x = 42;

Nothing in the standard library can ever do that!

(May we ask what you use those macros for? Situations that actually need
them are kind'a rare...)

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