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51 lines
1.5 KiB
Plaintext
51 lines
1.5 KiB
Plaintext
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This directory contains files associated with building large numbers
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of templates needed to represent different numbers of parameters.
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The file signal.macros.m4 defines all necessary macros for construction
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of templates with variable arguments.
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These files will be placed in $(INCLUDE_DIR)/sigc++/macros for
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reuse.
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Requires:
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Gnu M4 (others m4 may work)
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Macros of particular interest:
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IF(arg1,arg2[,arg3]) - if arg1 non-zero length print arg2, else arg3
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LIST(arg0,cond0 [,arg1,cond1]) - generates comma seperated list with
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conditions for each argument
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ARG_CLASS([P1,P2, ... ]) - generates string "class P1,class P2"
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ARG_BOTH([P1,P2, ... ]) - generates string "P1 p1,P2 p2"
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ARG_TYPE([P1,P2, ... ]) - generates string "P1,P2"
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ARG_NAME([P1,P2, ... ]) - generates string "p1,p2"
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[name]NUM(arg) - prints name#, where # is items in arg
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ARGS(P,n) - generates string [P1,P2,...Pn]
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example:
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To generalize this...
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template<class P1,class P2> // needs to be inline for zero arguments
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void Foo::func2(int (*f)(P1,P2),P1 p1,P2 p2)
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{func(p1,p2);
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}
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Use this...
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include(template.macros.m4)
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define([FOO_FUNC],
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[
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IF([$1],template<ARG_CLASS($1)>,inline)
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void Foo::[func]NUM($1)(LIST(int (*f)(ARG_TYPE($1)),1,ARG_BOTH($1),[$1]))
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{func(ARG_NAME($1));
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}
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])
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FOO_FUNC(ARGS(P,0))
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FOO_FUNC(ARGS(P,1))
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FOO_FUNC(ARGS(P,2))
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(to prove it m4 this README file. Honest!)
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