From 2b481093b02b76d49ac567aecc1a5fcc63bb6826 Mon Sep 17 00:00:00 2001
From: Sandipan Mohanty <s.mohanty@fz-juelich.de>
Date: Fri, 10 Jun 2022 14:32:30 +0200
Subject: [PATCH] Use thrust counting iterator in mandelbrot1.cc
---
day4/examples/mandelbrot1.cc | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/day4/examples/mandelbrot1.cc b/day4/examples/mandelbrot1.cc
index 03e5e18..81e9087 100644
--- a/day4/examples/mandelbrot1.cc
+++ b/day4/examples/mandelbrot1.cc
@@ -1,4 +1,4 @@
-#include "CountingIterator.hh"
+#include <thrust/iterator/counting_iterator.h>
#include <algorithm>
#include <chrono>
#include <complex>
@@ -8,6 +8,9 @@
#include <string>
#include <vector>
+template <class T>
+using CountingIterator = thrust::counting_iterator<T>;
+
void save_pgm(std::string filename, size_t width, size_t height,
std::vector<unsigned char> data)
{
@@ -29,7 +32,7 @@ auto mandel(size_t width, size_t height) -> std::vector<unsigned char>
double aspect = static_cast<double>(width) / height;
std::vector<unsigned char> ans(width * height, 0);
CountingIterator<size_t> beg { 0 }, end { width * height };
- std::transform(std::execution::par, beg, end,
+ std::transform(std::execution::par_unseq, beg, end,
ans.begin(), [=](size_t index) {
double myrow = index / width;
double mycol = index % width;
--
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