libstdc++-v3/testsuite/experimental/synchronized_value.cc

   1 // { dg-do run { target c++17 } }
   2
   3 #include <experimental/synchronized_value>
   4 #include <testsuite_hooks.h>
   5 #include <string>
   6
   7 using std::experimental::synchronized_value;
   8
   9 synchronized_value<std::string> s;
  10
  11 std::string read_value(){
  12   return apply([](auto& x){return x;},s);
  13 }
  14
  15 void set_value(std::string const& new_val){
  16   apply([&](auto& x){ x = new_val; }, s);
  17 }
  18
  19 void
  20 test_single()
  21 {
  22   set_value("new value");
  23   VERIFY( read_value() == "new value" );
  24 }
  25
  26 void
  27 test_multi()
  28 {
  29   synchronized_value<int> a(1), b(2), c(3);
  30   int sum = apply([](auto&... ints) { return (ints++ + ...); }, a, b, c);
  31   VERIFY( sum == 6 );
  32   auto get = [](int& i) { return i; };
  33   VERIFY( apply(get, a) == 2 );
  34   VERIFY( apply(get, b) == 3 );
  35   VERIFY( apply(get, c) == 4 );
  36 }
  37
  38 int main()
  39 {
  40   test_single();
  41   test_multi();
  42 }