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//===--- operator_new.cc - test input file for iwyu -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// IWYU_ARGS: -std=c++17 -I .
// Test that iwyu suggests the include for <new> be removed if only
// built-in functions are used.
#include <new>
#include "tests/cxx/direct.h"
// The most primitive ::operator new/delete are builtins, and are basically
// wrappers around malloc.
void ExplicitOperators() {
// IWYU: IndirectClass needs a declaration
// IWYU: IndirectClass is...*indirect.h
IndirectClass* elem = (IndirectClass*)::operator new(sizeof(IndirectClass));
::operator delete(elem);
// IWYU: IndirectClass needs a declaration
IndirectClass* arr =
// IWYU: IndirectClass needs a declaration
// IWYU: IndirectClass is...*indirect.h
(IndirectClass*)::operator new[](4 * sizeof(IndirectClass));
::operator delete[](arr);
}
// New- and delete-expressions, unless using placement syntax, only use builtin
// operators. They're equivalent with the above, but also run ctors/dtors.
// For placement syntax, see tests/cxx/placement_new.cc
void ExpressionsBuiltinTypes() {
char* elem = new char;
delete elem;
int* arr = new int[4];
delete[] arr;
}
// New- and delete-expressions with user-defined types.
void ExpressionsUserTypes() {
// IWYU: IndirectClass needs a declaration
// IWYU: IndirectClass is...*indirect.h
IndirectClass* elem = new IndirectClass;
// IWYU: IndirectClass is...*indirect.h
delete elem;
// IWYU: IndirectClass needs a declaration
// IWYU: IndirectClass is...*indirect.h
IndirectClass* arr = new IndirectClass[4];
// IWYU: IndirectClass is...*indirect.h
delete[] arr;
}
// Aligned allocation uses operator new(size_t, std::align_val_t) under the
// hood in C++17, but does not require <new> to be included for it. Pre-C++17,
// the alignment is silently ignored (or unsupported if the standard library
// does not support aligned allocation).
void ImplicitAlignedAllocation() {
struct alignas(32) Aligned {
float value[8];
};
Aligned* elem = new Aligned;
delete elem;
Aligned* arr = new Aligned[10];
delete[] arr;
}
/**** IWYU_SUMMARY
tests/cxx/operator_new.cc should add these lines:
#include "tests/cxx/indirect.h"
tests/cxx/operator_new.cc should remove these lines:
- #include <new> // lines XX-XX
- #include "tests/cxx/direct.h" // lines XX-XX
The full include-list for tests/cxx/operator_new.cc:
#include "tests/cxx/indirect.h" // for IndirectClass
***** IWYU_SUMMARY */
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