Displaying 4 results from an estimated 4 matches for "union_test".
2009 Apr 04
1
comparing columns in a dataframe
...code that I have started with.
Ideally I would like to identify the actual row numbers where there
is difference in the variables (either pairwise or between 3 variables).
x <- read.csv("c://rec_compare.csv",header=T, as.is=TRUE)
u <- union(x$rm1, x$redc1)
write.csv(u,"c:/union_test.csv")
i <- intersect(x$rm1, x$redc1)
write.csv(i,"c:/intersect_test.csv")
sd <- setdiff(x$rm1, x$redc1)
write.csv(sd,"c:/setdiff_test.csv")
Any suggestions are appreciated.
regards
Bob
2018 Mar 19
4
RFC: Devirtualization v2
...e virtually
no one is using unions this way, this should not cause any problems.struct
A { virtual void foo();};struct B : A { void foo() override;};union U {
A a; B b; U() : b() {}};void do_call(A &a) {
a.foo();}__attribute__((noinline)) void init_B(U &u) { new(&u.b)
B;}void union_test(U &u) { do_call(u.b); new(&u.a) A; do_call(u.a);
init_B(u); do_call(u.b);}int main() { U u; union_test(u);}Ptr to
intIn this example, instead of comparing the pointers we compare the
addresses stored in integers. Because ptrtoint conversion will also require
call to strip.inva...
2018 Mar 28
0
[cfe-dev] RFC: Devirtualization v2
...> struct B : A {
> void foo() override;
> };
>
> union U {
> A a;
> B b;
> U() : b() {}
> };
>
> void do_call(A &a) {
> a.foo();
> }
>
> __attribute__((noinline)) void init_B(U &u) {
> new(&u.b) B;
> }
>
> void union_test(U &u) {
> do_call(u.b);
> new(&u.a) A;
> do_call(u.a);
>
> init_B(u);
> do_call(u.b);
>
> }
>
> int main() {
> U u;
> union_test(u);
> }
> Ptr to int
> In this example, instead of comparing the pointers we compare the addr...
2018 Mar 29
2
[cfe-dev] RFC: Devirtualization v2
...s using unions this way, this should not cause any problems.struct
> A { virtual void foo();};struct B : A { void foo() override;};union U {
> A a; B b; U() : b() {}};void do_call(A &a) {
> a.foo();}__attribute__((noinline)) void init_B(U &u) { new(&u.b)
> B;}void union_test(U &u) { do_call(u.b); new(&u.a) A; do_call(u.a);
> init_B(u); do_call(u.b);}int main() { U u; union_test(u);}Ptr to
> intIn this example, instead of comparing the pointers we compare the
> addresses stored in integers. Because ptrtoint conversion will also require
>...