// C++N4606 Committee Draft, Standard for Programming Language C++
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2016/n4606.pdf
#define msg "C++N4606(259) 26.7.2.5 valarray subset operations [valarray.sub] p1100.cpp"
// Edited by Dr. Ogawa Kiyoshi. Compile procedure and results record.

#include <cstdlib>
#include <numeric>
#include <iostream>
#include <array>
#include <iterator>
#include <valarray>
using namespace std; /// add from compiler errors
int main() {
  {
    const valarray<char> v0("abcdefghijklmnop", 16);
// v0[slice(2, 5, 3)] returns valarray<char>("cfilo", 5)
  }
  {
    valarray<char> v0("abcdefghijklmnop", 16);
    valarray<char> v1("ABCDE", 5);
    v0[slice(2, 5, 3)] = v1;
  }
  {
// v0 == valarray<char>("abAdeBghCjkDmnEp", 16);
    const valarray<char> v0("abcdefghijklmnop", 16);
    const size_t lv[] = { 2, 3 };
    const size_t dv[] = { 7, 2 };
    const valarray<size_t> len(lv, 2), str(dv, 2);
// v0[gslice(3, len, str)] returns
// valarray<char>("dfhkmo", 6)
  }
  {
    valarray<char> v0("abcdefghijklmnop", 16);
    valarray<char> v1("ABCDEF", 6);
    const size_t lv[] = { 2, 3 };
    const size_t dv[] = { 7, 2 };
    const valarray<size_t> len(lv, 2), str(dv, 2);
    v0[gslice(3, len, str)] = v1;
// v0 == valarray<char>("abcAeBgCijDlEnFp", 16)
  }
  {
    const valarray<char> v0("abcdefghijklmnop", 16);
    const bool vb[] = { false, false, true, true, false, true };
// v0[valarray<bool>(vb, 6)] returns
// valarray<char>("cdf", 3)
  }
  {
    valarray<char> v0("abcdefghijklmnop", 16);
    valarray<char> v1("ABC", 3);
    const bool vb[] = { false, false, true, true, false, true };
    v0[valarray<bool>(vb, 6)] = v1;
// v0 == valarray<char>("abABeCghijklmnop", 16)
  }
  {
    const valarray<char> v0("abcdefghijklmnop", 16);
    const size_t vi[] = { 7, 5, 2, 3, 8 };
// v0[valarray<size_t>(vi, 5)] returns
// valarray<char>("hfcdi", 5)
  }
  {
    valarray<char> v0("abcdefghijklmnop", 16);
    valarray<char> v1("ABCDE", 5);
    const size_t vi[] = { 7, 5, 2, 3, 8 };
    v0[valarray<size_t>(vi, 5)] = v1;
// v0 == valarray<char>("abCDeBgAEjklmnop", 16)
  }

  std::cout<< msg << std::endl;
  return EXIT_SUCCESS;
}

$ ./cppall.sh p1100
$ clang++ p1100.cpp -std=c++03 -Wall
p1100.cpp:43:12: warning: unused variable 'vb' [-Wunused-variable]
const bool vb[] = { false, false, true, true, false, true };
           ^
p1100.cpp:56:14: warning: unused variable 'vi' [-Wunused-variable]
const size_t vi[] = { 7, 5, 2, 3, 8 };
             ^
2 warnings generated.
C++N4606(259) 26.7.2.5 valarray subset operations [valarray.sub] p1100.cpp
$ clang++ p1100.cpp -std=c++11 -Wall
p1100.cpp:43:12: warning: unused variable 'vb' [-Wunused-variable]
const bool vb[] = { false, false, true, true, false, true };
           ^
p1100.cpp:56:14: warning: unused variable 'vi' [-Wunused-variable]
const size_t vi[] = { 7, 5, 2, 3, 8 };
             ^
2 warnings generated.
C++N4606(259) 26.7.2.5 valarray subset operations [valarray.sub] p1100.cpp
$ clang++ p1100.cpp -std=c++17 -Wall
p1100.cpp:43:12: warning: unused variable 'vb' [-Wunused-variable]
const bool vb[] = { false, false, true, true, false, true };
           ^
p1100.cpp:56:14: warning: unused variable 'vi' [-Wunused-variable]
const size_t vi[] = { 7, 5, 2, 3, 8 };
             ^
2 warnings generated.
C++N4606(259) 26.7.2.5 valarray subset operations [valarray.sub] p1100.cpp

$ g++-7 p1100.cpp -std=c++03  -Wall
In file included from /usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/array:35:0,
                 from p1100.cpp:9:
/usr/local/Cellar/gcc/7.3.0_1/include/c++/7.3.0/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support \
  ^~~~~
p1100.cpp: In function 'int main()':
p1100.cpp:43:12: warning: unused variable 'vb' [-Wunused-variable]
 const bool vb[] = { false, false, true, true, false, true };
            ^~
p1100.cpp:56:14: warning: unused variable 'vi' [-Wunused-variable]
 const size_t vi[] = { 7, 5, 2, 3, 8 };
              ^~

$ g++-7 p1100.cpp -std=c++11  -Wall
p1100.cpp: In function 'int main()':
p1100.cpp:43:12: warning: unused variable 'vb' [-Wunused-variable]
 const bool vb[] = { false, false, true, true, false, true };
            ^~
p1100.cpp:56:14: warning: unused variable 'vi' [-Wunused-variable]
 const size_t vi[] = { 7, 5, 2, 3, 8 };
              ^~
C++N4606(259) 26.7.2.5 valarray subset operations [valarray.sub] p1100.cpp

$ g++-7 p1100.cpp -std=c++17  -Wall
p1100.cpp: In function 'int main()':
p1100.cpp:43:12: warning: unused variable 'vb' [-Wunused-variable]
 const bool vb[] = { false, false, true, true, false, true };
            ^~
p1100.cpp:56:14: warning: unused variable 'vi' [-Wunused-variable]
 const size_t vi[] = { 7, 5, 2, 3, 8 };
              ^~
C++N4606(259) 26.7.2.5 valarray subset operations [valarray.sub] p1100.cpp