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/* Tests for interactions between C++ and assert.
Copyright (C) 2017-2026 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* Undefine NDEBUG to ensure the build system e.g. CFLAGS/CXXFLAGS
does not disable the asserts we want to test. */
#undef NDEBUG
#include <assert.h>
#if __GNUC_PREREQ (5, 0)
template <typename> struct is_void { static const bool value = false; };
template <> struct is_void <void> { static const bool value = true; };
static_assert(is_void <decltype (assert (""))>::value, "type is void");
/* The C++ standard requires that if the assert argument is a constant
subexpression, then the assert itself is one, too. */
constexpr int
check_constexpr ()
{
return (assert (true), 1);
}
/* Objects of this class can be contextually converted to bool, but
cannot be compared to int. */
struct no_int
{
no_int () = default;
no_int (const no_int &) = delete;
explicit operator bool () const
{
return true;
}
bool operator! () const; /* No definition. */
template <class T> bool operator== (T) const; /* No definition. */
template <class T> bool operator!= (T) const; /* No definition. */
};
/* This class tests that operator== is not used by assert. */
struct bool_and_int
{
bool_and_int () = default;
bool_and_int (const no_int &) = delete;
explicit operator bool () const
{
return true;
}
bool operator! () const; /* No definition. */
template <class T> bool operator== (T) const; /* No definition. */
template <class T> bool operator!= (T) const; /* No definition. */
};
/* Scoped enumerations are not contextually convertible to bool. */
enum class E { e1 = 1 };
int&
preincrement (int& i)
{
return ++i;
}
static int
do_test ()
{
{
no_int value;
assert (value);
}
{
bool_and_int value;
assert (value);
}
{
assert ([] { return true; } ());
}
{
assert (bool (E::e1));
/* Ill-formed, E::e1 is not contextually convertible to bool. */
// assert (E::e1);
}
{
int i = 0;
assert (preincrement (i) > 0);
if (i != 1)
return 1;
}
return 0;
}
#define NDEBUG
#include <assert.h>
static_assert(is_void <decltype (assert (""))>::value, "type is void with NDEBUG");
#else
#include <support/test-driver.h>
static int
do_test ()
{
return EXIT_UNSUPPORTED;
}
#endif
#include <support/test-driver.c>
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