libstdc++-v3/testsuite/23_containers/default_template_value.cc

   1 // { dg-do compile { target c++26 } }
   2
   3 #include <deque>
   4 #include <forward_list>
   5 #include <list>
   6 #include <string>
   7 #include <vector>
   8
   9 #if !defined(__cpp_lib_algorithm_default_value_type)
  10 #error "Feature test macro for default template type for algorithms' values is missing"
  11 #elif __cpp_lib_algorithm_default_value_type < 202403L
  12 #error "Feature test macro for default template type for algorithms' values is wrong"
  13 #endif
  14
  15 struct S {
  16   S(int, double);
  17   friend auto operator<=>(const S&, const S&) = default;
  18 };
  19
  20 template<template<typename...> typename Container>
  21 void test_erase()
  22 {
  23   Container<S> c;
  24   std::erase(c, {1, 3.14});
  25 }
  26
  27 void
  28 test()
  29 {
  30   test_erase<std::deque>();
  31   test_erase<std::forward_list>();
  32   test_erase<std::list>();
  33   test_erase<std::vector>();
  34
  35   std::string s;
  36   std::erase(s, {'x'});
  37
  38   std::wstring ws;
  39   std::erase(ws, {L'x'});
  40 }