int main()
{
{
// sample(c_range_usage_1)
const int num = num_xs();
for (int i = 0; i < num; ++i) {
const X * x = get_x(i);
use(x);
}
// end-sample
}
{
// sample(c_range_usage_2)
const int num = num_xs();
std::vector<X*> xs(num);
get_xs(&xs[0]);
for (auto x : xs) {
use(x);
}
// end-sample
}
{
// sample(c_range_usage_3)
int num = num_xs();
// some code to here change num,
// in order to take a subset of num_xs() ...
for (int i = 0; i < num; ++i) {
const X * x = get_x(i);
use(x);
}
// end-sample
}
{
// sample(c_range_usage_4)
int num = num_xs();
// Fiery explosion when i == num - 1.
// If we're lucky.
for (int i = 0; i < num; ++i) {
const X * x = get_x(i);
if (i == some_index())
remove_x(i);
use(x);
}
}
// end-sample
{
// sample(c++_lazy_range_usage)
x_range range = get_xs();
for (auto const & x : range) {
use(x);
}
// This will use memcpy for PODs, etc.
std::vector<X> copy_of_xs(size(range));
std::copy(begin(range),
end(range),
copy_of_xs.begin());
// end-sample
}
return 0;
}
X():xs(get_xs()) {}
