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author | Ben Longbons <b.r.longbons@gmail.com> | 2015-01-03 21:07:56 -0800 |
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committer | Ben Longbons <b.r.longbons@gmail.com> | 2015-01-03 21:58:26 -0800 |
commit | 00da6b5977574a0564169172227d8aab45be188f (patch) | |
tree | dd52eee506a98e1eb9fcdea52e7db25079a7ad28 /src/compat/attr.hpp | |
parent | 4c91abd6a020ee030114ae3f22d8f6066e7528be (diff) | |
download | tmwa-00da6b5977574a0564169172227d8aab45be188f.tar.gz tmwa-00da6b5977574a0564169172227d8aab45be188f.tar.bz2 tmwa-00da6b5977574a0564169172227d8aab45be188f.tar.xz tmwa-00da6b5977574a0564169172227d8aab45be188f.zip |
Switch MATCH to separate begin/end macros
The for loop trick turned out to be very prone to infinite loops
at runtime. It's better to force compiler errors even if it's ugly.
Diffstat (limited to 'src/compat/attr.hpp')
-rw-r--r-- | src/compat/attr.hpp | 24 |
1 files changed, 0 insertions, 24 deletions
diff --git a/src/compat/attr.hpp b/src/compat/attr.hpp index 9ddf654..5ebef6d 100644 --- a/src/compat/attr.hpp +++ b/src/compat/attr.hpp @@ -30,28 +30,4 @@ namespace tmwa #endif #define JOIN(a, b) a##b - -// first loop: -// declare flag 'guard' (initially true) -// declare flag 'broken' (initially false) -// condition is 'guard' must be true, which is the case only for the first iteration -// post checks 'broken' and if set, break the loop -// second loop: -// declare public 'var' variable -// condition is that 'guard' must be true -// post sets 'guard' to false to make this loop run only once -// third loop: -// enable broken flag; it will remain set if 'break' is in the loop -// condition is that 'broken' must be true -// post sets 'broken' to false, which then fails the condition -// if user has a 'break' inside, then 'broken' will be true -// in either case, go back to the second loop's post -#define WITH_VAR_INLOOP(ty, var, expr) \ - for (bool JOIN(var, _guard) = true, JOIN(var, _broken) = false; JOIN(var, _guard); ({if (JOIN(var, _broken)) { break; } })) \ - for (ty var = expr; JOIN(var, _guard); JOIN(var, _guard) = false) \ - for (JOIN(var, _broken) = true; JOIN(var, _broken); JOIN(var, _broken) = false) -#define WITH_VAR_NOLOOP(ty, var, expr) \ - for (bool JOIN(var, _guard) = true, JOIN(var, _broken) = false; JOIN(var, _guard); ({if (JOIN(var, _broken)) {abort();} })) \ - for (ty var = expr; JOIN(var, _guard); JOIN(var, _guard) = false) \ - for (JOIN(var, _broken) = true; JOIN(var, _broken); JOIN(var, _broken) = false) } // namespace tmwa |