llvm-project/clang-tools-extra/test/clang-tidy/modernize-use-emplace-ignore-implicit-constructors.cpp

// RUN: %check_clang_tidy %s modernize-use-emplace %t -- \
// RUN:   -config="{CheckOptions: \
// RUN:             [{key: modernize-use-emplace.IgnoreImplicitConstructors, \
// RUN:               value: 1}] \
// RUN:             }" -- -std=c++11

namespace std {
template <typename>
class initializer_list
{
public:
  initializer_list() noexcept {}
};

template <typename T>
class vector {
public:
  vector() = default;
  vector(initializer_list<T>) {}

  void push_back(const T &) {}
  void push_back(T &&) {}

  template <typename... Args>
  void emplace_back(Args &&... args){};
  ~vector();
};

} // namespace std

void testInts() {
  std::vector<int> v;
  v.push_back(42);
  v.push_back(int(42));
  v.push_back(int{42});
  v.push_back(42.0);
  int z;
  v.push_back(z);
}

struct Something {
  Something(int a, int b = 41) {}
  Something() {}
  void push_back(Something);
  int getInt() { return 42; }
};

struct Convertable {
  operator Something() { return Something{}; }
};

struct Zoz {
  Zoz(Something, int = 42) {}
};

Zoz getZoz(Something s) { return Zoz(s); }

void test_Something() {
  std::vector<Something> v;

  v.push_back(Something(1, 2));
  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back instead of push_back [modernize-use-emplace]
  // CHECK-FIXES: v.emplace_back(1, 2);

  v.push_back(Something{1, 2});
  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
  // CHECK-FIXES: v.emplace_back(1, 2);

  v.push_back(Something());
  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
  // CHECK-FIXES: v.emplace_back();

  v.push_back(Something{});
  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
  // CHECK-FIXES: v.emplace_back();

  Something Different;
  v.push_back(Something(Different.getInt(), 42));
  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
  // CHECK-FIXES: v.emplace_back(Different.getInt(), 42);

  v.push_back(Different.getInt());
  v.push_back(42);

  Something temporary(42, 42);
  temporary.push_back(temporary);
  v.push_back(temporary);

  v.push_back(Convertable());
  v.push_back(Convertable{});
  Convertable s;
  v.push_back(s);
}

template <typename ElemType>
void dependOnElem() {
  std::vector<ElemType> v;
  v.push_back(ElemType(42));
}

template <typename ContainerType>
void dependOnContainer() {
  ContainerType v;
  v.push_back(Something(42));
}

void callDependent() {
  dependOnElem<Something>();
  dependOnContainer<std::vector<Something>>();
}

void test2() {
  std::vector<Zoz> v;
  v.push_back(Zoz(Something(21, 37)));
  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
  // CHECK-FIXES: v.emplace_back(Something(21, 37));

  v.push_back(Zoz(Something(21, 37), 42));
  // CHECK-MESSAGES: :[[@LINE-1]]:5: warning: use emplace_back
  // CHECK-FIXES: v.emplace_back(Something(21, 37), 42);

  v.push_back(getZoz(Something(1, 2)));
}