<cassert>

<cstddef>
<cstdlib>
<version> (C++20)
<limits>
<climits>

<cfloat>
<cstdint> (C++11)
<stdfloat> (C++23)
<new>
<typeinfo>

<source_location> (C++20)
<exception>
<initializer_list> (C++11)
<compare> (C++20)

<coroutine> (C++20)
<csignal>
<csetjmp>
<cstdarg>

<concepts> (C++20)

<stdexcept>
<stacktrace> (C++23)

<cassert>

<cerrno>

<system_error> (C++11)

<memory_resource> (C++17)

<scoped_allocator> (C++11)

<type_traits> (C++11)

<ratio> (C++11)

<utility>
<tuple> (C++11)
<optional> (C++17)
<variant> (C++17)

<any> (C++17)
<expected> (C++23)
<bitset>

<functional>
<typeindex> (C++11)
<execution> (C++17)

<charconv> (C++17)
<format> (C++20)
<bit> (C++20)

<string_view> (C++17)
<string>

<cctype>
<cwctype>

<cstring>
<cwchar>

<cuchar> (C++11)

<array> (C++11)
<deque>
<forward_list> (C++11)
<list>

<vector>
<map>
<set>
<unordered_map> (C++11)

<unordered_set> (C++11)
<queue>
<stack>
<flat_map> (C++23)

<flat_set> (C++23)
<span> (C++20)
<mdspan> (C++23)

<ranges> (C++20)

<generator> (C++23)

<cfenv> (C++11)
<complex>

<random> (C++11)
<valarray>

<cmath>

<numbers> (C++20)

<chrono> (C++11)

<ctime>

<codecvt> (C++11/17*)

/

<iosfwd>
<iostream>
<ios>
<streambuf>

<istream>
<ostream>
<iomanip>
<print> (C++23)

<sstream>
<spanstream> (C++23)
<fstream>
<syncstream> (C++20)

<filesystem> (C++17)
<cstdio>
<cinttypes> (C++11)
<strstream> (C++98*)

<regex> (C++11)

<stop_token> (C++20)
<thread> (C++11)
<atomic> (C++11)

<stdatomic.h> (C++23)
<mutex> (C++11)
<shared_mutex> (C++14)

<condition_variable> (C++11)
<semaphore> (C++20)
<latch> (C++20)

<barrier> (C++20)
<future> (C++11)

C

<cstdbool> (C++11/17/20*)
<ccomplex> (C++11/17/20*)

<ctgmath> (C++11/17/20*)

<cstdalign> (C++11/17/20*)

<ciso646> ( C++20)

[edit]

C <assert.h>.

.


assert	, `true`. (-) []

#define assert(E) /*   */

cppreference.com

<cassert>