lldb/test/API/lang/cpp/template-function/main.cpp

   1 template<typename T>
   2 int foo(T t1) {
   3         return int(t1);
   4 }
   5
   6 // Some cases to cover ADL, we have two cases:
   7 //
   8 // - f which will have a overload in the global namespace if unqualified lookup
   9 // find f(int) and f(T) is found via ADL.
  10 //
  11 // - g which does not have an overload in the global namespace.
  12 namespace A {
  13 struct C {};
  14
  15 template <typename T> int f(T) { return 4; }
  16
  17 template <typename T> int g(T) { return 4; }
  18 } // namespace A
  19
  20 // Meant to overload A::f(T) which may be found via ADL
  21 int f(int) { return 1; }
  22
  23 // Regular overloaded functions case h(T) and h(double).
  24 template <class T> int h(T x) { return x; }
  25 int h(double d) { return 5; }
  26
  27 template <class... Us> int var(Us... pargs) { return 10; }
  28
  29 // Having the templated overloaded operators in a namespace effects the
  30 // mangled name generated in the IR e.g. _ZltRK1BS1_ Vs _ZN1AltERKNS_1BES2_
  31 // One will be in the symbol table but the other won't. This results in a
  32 // different code path that will result in CPlusPlusNameParser being used.
  33 // This allows us to cover that code as well.
  34 namespace A {
  35 template <typename T> bool operator<(const T &, const T &) { return true; }
  36
  37 template <typename T> bool operator>(const T &, const T &) { return true; }
  38
  39 template <typename T> bool operator<<(const T &, const T &) { return true; }
  40
  41 template <typename T> bool operator>>(const T &, const T &) { return true; }
  42
  43 template <typename T> bool operator==(const T &, const T &) { return true; }
  44
  45 struct B {};
  46 } // namespace A
  47
  48 struct D {};
  49
  50 // Make sure we cover more straight forward cases as well.
  51 bool operator<(const D &, const D &) { return true; }
  52 bool operator>(const D &, const D &) { return true; }
  53 bool operator>>(const D &, const D &) { return true; }
  54 bool operator<<(const D &, const D &) { return true; }
  55 bool operator==(const D &, const D &) { return true; }
  56
  57 int main() {
  58   A::B b1;
  59   A::B b2;
  60   D d1;
  61   D d2;
  62
  63   bool result_b = b1 < b2 && b1 << b2 && b1 == b2 && b1 > b2 && b1 >> b2;
  64   bool result_c = d1 < d2 && d1 << d2 && d1 == d2 && d1 > d2 && d1 >> d2;
  65
  66   return foo(42) + result_b + result_c + f(A::C{}) + g(A::C{}) + h(10) + h(1.) +
  67          var(1) + var(1, 2); // break here
  68 }