[libcxx] r228706 - Remove use of zero length arrays in tests. Get tests passing with -pedantic-errors
Eric Fiselier
eric at efcs.ca
Tue Feb 10 08:51:29 PST 2015
Author: ericwf
Date: Tue Feb 10 10:51:29 2015
New Revision: 228706
URL: http://llvm.org/viewvc/llvm-project?rev=228706&view=rev
Log:
Remove use of zero length arrays in tests. Get tests passing with -pedantic-errors
Modified:
libcxx/trunk/test/std/containers/associative/map/map.special/member_swap.pass.cpp
libcxx/trunk/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp
libcxx/trunk/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp
libcxx/trunk/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp
libcxx/trunk/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp
libcxx/trunk/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp
libcxx/trunk/test/std/containers/associative/set/set.special/member_swap.pass.cpp
libcxx/trunk/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp
Modified: libcxx/trunk/test/std/containers/associative/map/map.special/member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/map/map.special/member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/map/map.special/member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/map/map.special/member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -20,18 +20,12 @@
int main()
{
- {
typedef std::pair<const int, double> V;
+ {
typedef std::map<int, double> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -39,9 +33,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -53,7 +44,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -69,11 +60,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -110,17 +98,10 @@ int main()
}
#if __cplusplus >= 201103L
{
- typedef std::pair<const int, double> V;
typedef std::map<int, double, std::less<int>, min_allocator<V>> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -128,9 +109,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -142,7 +120,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -158,11 +136,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
Modified: libcxx/trunk/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/map/map.special/non_member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -23,18 +23,12 @@
int main()
{
- {
typedef std::pair<const int, double> V;
+ {
typedef std::map<int, double> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -42,9 +36,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -56,7 +47,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -72,11 +63,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -181,17 +169,10 @@ int main()
}
#if __cplusplus >= 201103L
{
- typedef std::pair<const int, double> V;
typedef std::map<int, double, std::less<int>, min_allocator<V>> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -199,9 +180,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -213,7 +191,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -229,11 +207,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
Modified: libcxx/trunk/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/multimap/multimap.special/member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -24,14 +24,8 @@ int main()
{
typedef std::multimap<int, double> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -39,9 +33,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -53,7 +44,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -69,11 +60,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -112,14 +100,8 @@ int main()
{
typedef std::multimap<int, double, std::less<int>, min_allocator<std::pair<const int, double>>> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -127,9 +109,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -141,7 +120,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -157,11 +136,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
Modified: libcxx/trunk/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/multimap/multimap.special/non_member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -27,14 +27,8 @@ int main()
{
typedef std::multimap<int, double> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -42,9 +36,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -56,7 +47,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -72,11 +63,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -183,14 +171,8 @@ int main()
{
typedef std::multimap<int, double, std::less<int>, min_allocator<std::pair<const int, double>>> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -198,9 +180,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
V(5, 5),
@@ -212,7 +191,7 @@ int main()
V(11, 11),
V(12, 12)
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -228,11 +207,8 @@ int main()
V(3, 3),
V(4, 4)
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
Modified: libcxx/trunk/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/multiset/multiset.special/member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -24,14 +24,8 @@ int main()
typedef int V;
typedef std::multiset<int> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -39,9 +33,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
5,
@@ -53,7 +44,7 @@ int main()
11,
12
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -69,11 +60,8 @@ int main()
3,
4
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -113,14 +101,8 @@ int main()
typedef int V;
typedef std::multiset<int, std::less<int>, min_allocator<int>> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -128,9 +110,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
5,
@@ -142,7 +121,7 @@ int main()
11,
12
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -158,11 +137,8 @@ int main()
3,
4
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
Modified: libcxx/trunk/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/multiset/multiset.special/non_member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -23,14 +23,8 @@ int main()
typedef int V;
typedef std::multiset<int> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -38,9 +32,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
5,
@@ -52,7 +43,7 @@ int main()
11,
12
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -68,11 +59,8 @@ int main()
3,
4
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
Modified: libcxx/trunk/test/std/containers/associative/set/set.special/member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/set/set.special/member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/set/set.special/member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/set/set.special/member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -24,14 +24,8 @@ int main()
typedef int V;
typedef std::set<int> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -39,9 +33,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
5,
@@ -53,7 +44,7 @@ int main()
11,
12
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -69,11 +60,8 @@ int main()
3,
4
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -113,14 +101,8 @@ int main()
typedef int V;
typedef std::set<int, std::less<int>, min_allocator<int>> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
@@ -128,9 +110,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
5,
@@ -142,7 +121,7 @@ int main()
11,
12
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -158,11 +137,8 @@ int main()
3,
4
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
m1.swap(m2);
Modified: libcxx/trunk/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp?rev=228706&r1=228705&r2=228706&view=diff
==============================================================================
--- libcxx/trunk/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp (original)
+++ libcxx/trunk/test/std/containers/associative/set/set.special/non_member_swap.pass.cpp Tue Feb 10 10:51:29 2015
@@ -23,14 +23,8 @@ int main()
typedef int V;
typedef std::set<int> M;
{
- V ar1[] =
- {
- };
- V ar2[] =
- {
- };
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m1;
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
@@ -38,9 +32,6 @@ int main()
assert(m2 == m1_save);
}
{
- V ar1[] =
- {
- };
V ar2[] =
{
5,
@@ -52,7 +43,7 @@ int main()
11,
12
};
- M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
+ M m1;
M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
M m1_save = m1;
M m2_save = m2;
@@ -68,11 +59,8 @@ int main()
3,
4
};
- V ar2[] =
- {
- };
M m1(ar1, ar1+sizeof(ar1)/sizeof(ar1[0]));
- M m2(ar2, ar2+sizeof(ar2)/sizeof(ar2[0]));
+ M m2;
M m1_save = m1;
M m2_save = m2;
swap(m1, m2);
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