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#include <thrust/device_vector.h>
#include <thrust/sort.h>
#include <thrust/random.h>
#include <iostream>
#include <iomanip>
// Helper routines
void initialize(thrust::device_vector<int>& v)
{
thrust::default_random_engine rng(123456);
thrust::uniform_int_distribution<int> dist(10, 99);
for(size_t i = 0; i < v.size(); i++)
v[i] = dist(rng);
}
void initialize(thrust::device_vector<float>& v)
{
thrust::default_random_engine rng(123456);
thrust::uniform_int_distribution<int> dist(2, 19);
for(size_t i = 0; i < v.size(); i++)
v[i] = dist(rng) / 2.0f;
}
void initialize(thrust::device_vector< thrust::pair<int,int> >& v)
{
thrust::default_random_engine rng(123456);
thrust::uniform_int_distribution<int> dist(0,9);
for(size_t i = 0; i < v.size(); i++)
{
int a = dist(rng);
int b = dist(rng);
v[i] = thrust::make_pair(a,b);
}
}
void initialize(thrust::device_vector<int>& v1, thrust::device_vector<int>& v2)
{
thrust::default_random_engine rng(123456);
thrust::uniform_int_distribution<int> dist(10, 99);
for(size_t i = 0; i < v1.size(); i++)
{
v1[i] = dist(rng);
v2[i] = i;
}
}
void print(const thrust::device_vector<int>& v)
{
for(size_t i = 0; i < v.size(); i++)
std::cout << " " << v[i];
std::cout << "\n";
}
void print(const thrust::device_vector<float>& v)
{
for(size_t i = 0; i < v.size(); i++)
std::cout << " " << std::fixed << std::setprecision(1) << v[i];
std::cout << "\n";
}
void print(const thrust::device_vector< thrust::pair<int,int> >& v)
{
for(size_t i = 0; i < v.size(); i++)
{
thrust::pair<int,int> p = v[i];
std::cout << " (" << p.first << "," << p.second << ")";
}
std::cout << "\n";
}
void print(thrust::device_vector<int>& v1, thrust::device_vector<int> v2)
{
for(size_t i = 0; i < v1.size(); i++)
std::cout << " (" << v1[i] << "," << std::setw(2) << v2[i] << ")";
std::cout << "\n";
}
// user-defined comparison operator that acts like less<int>,
// except even numbers are considered to be smaller than odd numbers
struct evens_before_odds
{
__host__ __device__
bool operator()(int x, int y)
{
if (x % 2 == y % 2)
return x < y;
else if (x % 2)
return false;
else
return true;
}
};
int main(void)
{
size_t N = 16;
std::cout << "sorting integers\n";
{
thrust::device_vector<int> keys(N);
initialize(keys);
print(keys);
thrust::sort(keys.begin(), keys.end());
print(keys);
}
std::cout << "\nsorting integers (descending)\n";
{
thrust::device_vector<int> keys(N);
initialize(keys);
print(keys);
thrust::sort(keys.begin(), keys.end(), thrust::greater<int>());
print(keys);
}
std::cout << "\nsorting integers (user-defined comparison)\n";
{
thrust::device_vector<int> keys(N);
initialize(keys);
print(keys);
thrust::sort(keys.begin(), keys.end(), evens_before_odds());
print(keys);
}
std::cout << "\nsorting floats\n";
{
thrust::device_vector<float> keys(N);
initialize(keys);
print(keys);
thrust::sort(keys.begin(), keys.end());
print(keys);
}
std::cout << "\nsorting pairs\n";
{
thrust::device_vector< thrust::pair<int,int> > keys(N);
initialize(keys);
print(keys);
thrust::sort(keys.begin(), keys.end());
print(keys);
}
std::cout << "\nkey-value sorting\n";
{
thrust::device_vector<int> keys(N);
thrust::device_vector<int> values(N);
initialize(keys, values);
print(keys, values);
thrust::sort_by_key(keys.begin(), keys.end(), values.begin());
print(keys, values);
}
std::cout << "\nkey-value sorting (descending)\n";
{
thrust::device_vector<int> keys(N);
thrust::device_vector<int> values(N);
initialize(keys, values);
print(keys, values);
thrust::sort_by_key(keys.begin(), keys.end(), values.begin(), thrust::greater<int>());
print(keys, values);
}
return 0;
}
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