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Sum two rasters cell-by-cell

The following example is a simple case of opening two rasters and performing an cell-by-cell summation.

// example_3.cpp

#include <pronto/raster/io.h>
#include <pronto/raster/plot_raster.h>
#include <pronto/raster/raster_algebra_operators.h>


namespace pr = pronto::raster;

void create_rasters_for_demo()
{
  auto a = pr::create<int>("a.tif", 4, 5);
  auto b = pr::create<int>("b.tif", 4, 5);
  for (int i = 0; auto && v : a) { 
    v = ++i; 
  }

  for (int i = 0; auto && v : b) { 
     v = ++i * 100; }
  }

int main()
{
  create_rasters_for_demo();

  auto a = pr::open_variant("a.tif"); // assuming raster exists
  auto b = pr::open_variant("b.tif"); // assuming raster exists and same dimensions as "a.tif"
  auto c = a + b;

  plot_raster(c);

  return 0;
}

Output:

Rows: 4, Cols: 5, Value type: int
101     202     303     404     505
606     707     808     909     1010
1111    1212    1313    1414    1515
1616    1717    1818    1919    2020