clang/test/Modules/placement-new-reachable.cpp

   1 // RUN: rm -rf %t
   2 // RUN: mkdir -p %t
   3 // RUN: split-file %s %t
   4 //
   5 // RUN: %clang_cc1 -std=c++20 %t/A.cppm -emit-module-interface -o %t/A.pcm
   6 // RUN: %clang_cc1 -std=c++20 %t/Use.cpp -fprebuilt-module-path=%t -fsyntax-only -verify
   7
   8 //--- placement.h
   9 namespace std {
  10   using size_t = decltype(sizeof(0));
  11 }
  12 void *operator new(std::size_t, void *p) { return p; }
  13
  14 //--- A.cppm
  15 module;
  16 #include "placement.h"
  17 export module A;
  18 export template<class T>
  19 struct A {
  20     A(void *p) : ptr(new (p) T(43)) {}
  21 private:
  22     void *ptr;
  23 };
  24
  25 export struct B {
  26     B(void *p) : ptr(new (p) int(43)) {}
  27 private:
  28     void *ptr;
  29 };
  30
  31 //--- Use.cpp
  32 // expected-no-diagnostics
  33 import A;
  34 void bar(int *);
  35 void foo(void *ptr) {
  36     A<int>(nullptr); // Good. It should be OK to construct A.
  37     void *p = ::operator new(sizeof(int), ptr); // Bad. The function shouldn't be visible here.
  38     void *q = new (ptr) int(43); // Good. We don't call the placement allocation function directly.
  39 }