gistfile1.txt

mkdir test
cd test
cat > test.cc <<EOF
#include <memory>
#include <iostream>

using namespace std;

static const size_t kMaxSize = ~static_cast<size_t>(0);

static const size_t kNotTooBig = 100000;
// We want an allocation that is definitely more than main memory.  OS
// X has special logic to discard very big allocs before even passing
// the request along to the user-defined memory allocator; we're not
// interested in testing their logic, so we have to make sure we're
// not *too* big.
static const size_t kTooBig = kMaxSize - 100000;


int main() {
try {
char * p = new char[kTooBig];
cout << "Allocation OK\n";
}
catch (std::bad_alloc& a) {
cout << "Allocation threw bad alloc\n";
}
return 0;
}
EOF

g++ -m32 test.cc; ./a.out 
# Allocation threw bad alloc

g++ -m64 test.cc; ./a.out 
# Segmentation Fault (core dumped)