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From: ediaz@veridis.com To: gcc-gnats@gcc.gnu.org Subject: preprocessor/9689: Number: 9688 update : pasting "<" and "ValidStruct" does not give a valid preprocessing token Date: Thu, 13 Feb 2003 10:06:00 -0000 [thread overview] Message-ID: <20030213100014.27669.qmail@sources.redhat.com> (raw) >Number: 9689 >Category: preprocessor >Synopsis: Number: 9688 update : pasting "<" and "ValidStruct" does not give a valid preprocessing token >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: rejects-legal >Submitter-Id: net >Arrival-Date: Thu Feb 13 10:06:01 UTC 2003 >Closed-Date: >Last-Modified: >Originator: ediaz@veridis.com >Release: g++ (GCC) 3.3 20030212 (prerelease) >Organization: >Environment: SuSE 7.3/Linux >Description: c&p of the #9688 descripton : When I try to compile a file using macros of templates, I get a 'MyFileStruct.h:541:67: pasting "<" and "MyStruct" does not give a valid preprocessing token' message. It worked perfectly with the 2.95.x serie and with the 3.2.1 version. I've tryied to do it in two passes, with a --save-temps and a g++ thefile.ii -c and it worked. Like if the processed code was not the same as the preprocessor's output. ----------- I've made a better & cleaner example and attached it : >How-To-Repeat: Explanations in test2.cpp >Fix: Use the two passes trick. >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: text/plain; name="test2.cpp" Content-Disposition: inline; filename="test2.cpp" /* This is a better example of the problem (cleaner too) How to fail : sh-2.05$ g++ test2.cpp -o test2_fail test2.cpp:46:11: pasting "<" and "Field" does not give a valid preprocessing token How to success : sh-2.05$ g++ test2.cpp --save-temps test2.cpp:46:11: pasting "<" and "Field" does not give a valid preprocessing token sh-2.05$ g++ test2.ii -o test2_success sh-2.05$ I hope it will helps. Regards, Eric Diaz */ #include<stdlib.h> #include<stdio.h> #include<string.h> template <class T> class C { T hold; public: C(T to_hold) { hold=to_hold; } static void process(T a_value) { puts("Generic"); return 0; } }; #define CM(x) \ template<> \ class C < ##x > \ { \ public: \ static void process(x a_value) \ { \ puts("Not Generic (" #x ")"); \ } \ }; struct Field { }; struct Field2 { }; // The following will fail : CM( Field ) // The following, being a copy&paste of the .ii output for the CM( Field ) (with Field replaced by Field2) will work. template<> class C < Field2 > { public: static void process(Field2 a_value) { puts("Not Generic (" "Field2" ")"); } }; int main(int argc,char* argv[]) { Field f1; Field2 f2; C<Field>::process(f1); C<Field2>::process(f2); return 0; }
next reply other threads:[~2003-02-13 10:06 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-02-13 10:06 ediaz [this message] 2003-02-13 10:12 neil 2003-02-13 17:06 Zack Weinberg
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