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3666a048 | 1 | # Copyright (c) 2016-2021 Free Software Foundation, Inc. |
0bcda685 PA |
2 | # |
3 | # Originally based on the AX_CXX_COMPILE_STDCXX macro found at the url | |
4 | # below. | |
5 | # | |
6 | # Local GDB customizations: | |
7 | # | |
8 | # - AC_SUBST CXX_DIALECT instead of changing CXX/CXXCPP. | |
9 | # | |
87106a7b | 10 | # =========================================================================== |
41260ac2 | 11 | # https://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html |
87106a7b PA |
12 | # =========================================================================== |
13 | # | |
14 | # SYNOPSIS | |
15 | # | |
16 | # AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional]) | |
17 | # | |
18 | # DESCRIPTION | |
19 | # | |
20 | # Check for baseline language coverage in the compiler for the specified | |
21 | # version of the C++ standard. If necessary, add switches to CXX and | |
22 | # CXXCPP to enable support. VERSION may be '11' (for the C++11 standard) | |
23 | # or '14' (for the C++14 standard). | |
24 | # | |
25 | # The second argument, if specified, indicates whether you insist on an | |
26 | # extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. | |
27 | # -std=c++11). If neither is specified, you get whatever works, with | |
28 | # preference for an extended mode. | |
29 | # | |
30 | # The third argument, if specified 'mandatory' or if left unspecified, | |
31 | # indicates that baseline support for the specified C++ standard is | |
32 | # required and that the macro should error out if no mode with that | |
33 | # support is found. If specified 'optional', then configuration proceeds | |
34 | # regardless, after defining HAVE_CXX${VERSION} if and only if a | |
35 | # supporting mode is found. | |
36 | # | |
37 | # LICENSE | |
38 | # | |
39 | # Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com> | |
40 | # Copyright (c) 2012 Zack Weinberg <zackw@panix.com> | |
41 | # Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu> | |
42 | # Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com> | |
43 | # Copyright (c) 2015 Paul Norman <penorman@mac.com> | |
44 | # Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu> | |
41260ac2 | 45 | # Copyright (c) 2016 Krzesimir Nowak <qdlacz@gmail.com> |
87106a7b PA |
46 | # |
47 | # Copying and distribution of this file, with or without modification, are | |
48 | # permitted in any medium without royalty provided the copyright notice | |
49 | # and this notice are preserved. This file is offered as-is, without any | |
50 | # warranty. | |
51 | ||
41260ac2 | 52 | #serial 8 |
87106a7b PA |
53 | |
54 | dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro | |
55 | dnl (serial version number 13). | |
56 | ||
57 | AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl | |
41260ac2 SM |
58 | m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"], |
59 | [$1], [14], [ax_cxx_compile_alternatives="14 1y"], | |
60 | [$1], [17], [ax_cxx_compile_alternatives="17 1z"], | |
87106a7b PA |
61 | [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl |
62 | m4_if([$2], [], [], | |
63 | [$2], [ext], [], | |
64 | [$2], [noext], [], | |
65 | [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl | |
66 | m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true], | |
67 | [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true], | |
68 | [$3], [optional], [ax_cxx_compile_cxx$1_required=false], | |
69 | [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])]) | |
70 | AC_LANG_PUSH([C++])dnl | |
0bcda685 | 71 | CXX_DIALECT="" |
87106a7b PA |
72 | ac_success=no |
73 | AC_CACHE_CHECK(whether $CXX supports C++$1 features by default, | |
74 | ax_cv_cxx_compile_cxx$1, | |
75 | [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], | |
76 | [ax_cv_cxx_compile_cxx$1=yes], | |
77 | [ax_cv_cxx_compile_cxx$1=no])]) | |
78 | if test x$ax_cv_cxx_compile_cxx$1 = xyes; then | |
79 | ac_success=yes | |
80 | fi | |
81 | ||
82 | m4_if([$2], [noext], [], [dnl | |
83 | if test x$ac_success = xno; then | |
41260ac2 SM |
84 | for alternative in ${ax_cxx_compile_alternatives}; do |
85 | switch="-std=gnu++${alternative}" | |
87106a7b PA |
86 | cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) |
87 | AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, | |
88 | $cachevar, | |
89 | [ac_save_CXX="$CXX" | |
90 | CXX="$CXX $switch" | |
91 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], | |
92 | [eval $cachevar=yes], | |
93 | [eval $cachevar=no]) | |
94 | CXX="$ac_save_CXX"]) | |
95 | if eval test x\$$cachevar = xyes; then | |
0bcda685 | 96 | CXX_DIALECT="$switch" |
87106a7b PA |
97 | ac_success=yes |
98 | break | |
99 | fi | |
100 | done | |
101 | fi]) | |
102 | ||
103 | m4_if([$2], [ext], [], [dnl | |
104 | if test x$ac_success = xno; then | |
105 | dnl HP's aCC needs +std=c++11 according to: | |
106 | dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf | |
107 | dnl Cray's crayCC needs "-h std=c++11" | |
41260ac2 SM |
108 | for alternative in ${ax_cxx_compile_alternatives}; do |
109 | for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do | |
110 | cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) | |
111 | AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, | |
112 | $cachevar, | |
113 | [ac_save_CXX="$CXX" | |
114 | CXX="$CXX $switch" | |
115 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], | |
116 | [eval $cachevar=yes], | |
117 | [eval $cachevar=no]) | |
118 | CXX="$ac_save_CXX"]) | |
119 | if eval test x\$$cachevar = xyes; then | |
120 | CXX_DIALECT="$switch" | |
121 | ac_success=yes | |
122 | break | |
123 | fi | |
124 | done | |
125 | if test x$ac_success = xyes; then | |
87106a7b PA |
126 | break |
127 | fi | |
128 | done | |
129 | fi]) | |
130 | AC_LANG_POP([C++]) | |
131 | if test x$ax_cxx_compile_cxx$1_required = xtrue; then | |
132 | if test x$ac_success = xno; then | |
133 | AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.]) | |
134 | fi | |
135 | fi | |
136 | if test x$ac_success = xno; then | |
137 | HAVE_CXX$1=0 | |
138 | AC_MSG_NOTICE([No compiler with C++$1 support was found]) | |
139 | else | |
140 | HAVE_CXX$1=1 | |
141 | AC_DEFINE(HAVE_CXX$1,1, | |
142 | [define if the compiler supports basic C++$1 syntax]) | |
143 | fi | |
144 | AC_SUBST(HAVE_CXX$1) | |
0bcda685 | 145 | AC_SUBST(CXX_DIALECT) |
87106a7b PA |
146 | ]) |
147 | ||
148 | ||
149 | dnl Test body for checking C++11 support | |
150 | ||
151 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11], | |
152 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 | |
153 | ) | |
154 | ||
155 | ||
156 | dnl Test body for checking C++14 support | |
157 | ||
158 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14], | |
159 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 | |
160 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 | |
161 | ) | |
162 | ||
41260ac2 SM |
163 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17], |
164 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 | |
165 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 | |
166 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_17 | |
167 | ) | |
87106a7b PA |
168 | |
169 | dnl Tests for new features in C++11 | |
170 | ||
171 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[ | |
172 | ||
173 | // If the compiler admits that it is not ready for C++11, why torture it? | |
174 | // Hopefully, this will speed up the test. | |
175 | ||
176 | #ifndef __cplusplus | |
177 | ||
178 | #error "This is not a C++ compiler" | |
179 | ||
180 | #elif __cplusplus < 201103L | |
181 | ||
182 | #error "This is not a C++11 compiler" | |
183 | ||
184 | #else | |
185 | ||
186 | namespace cxx11 | |
187 | { | |
188 | ||
189 | namespace test_static_assert | |
190 | { | |
191 | ||
192 | template <typename T> | |
193 | struct check | |
194 | { | |
195 | static_assert(sizeof(int) <= sizeof(T), "not big enough"); | |
196 | }; | |
197 | ||
198 | } | |
199 | ||
200 | namespace test_final_override | |
201 | { | |
202 | ||
203 | struct Base | |
204 | { | |
205 | virtual void f() {} | |
206 | }; | |
207 | ||
208 | struct Derived : public Base | |
209 | { | |
210 | virtual void f() override {} | |
211 | }; | |
212 | ||
213 | } | |
214 | ||
215 | namespace test_double_right_angle_brackets | |
216 | { | |
217 | ||
218 | template < typename T > | |
219 | struct check {}; | |
220 | ||
221 | typedef check<void> single_type; | |
222 | typedef check<check<void>> double_type; | |
223 | typedef check<check<check<void>>> triple_type; | |
224 | typedef check<check<check<check<void>>>> quadruple_type; | |
225 | ||
226 | } | |
227 | ||
228 | namespace test_decltype | |
229 | { | |
230 | ||
231 | int | |
232 | f() | |
233 | { | |
234 | int a = 1; | |
235 | decltype(a) b = 2; | |
236 | return a + b; | |
237 | } | |
238 | ||
239 | } | |
240 | ||
241 | namespace test_type_deduction | |
242 | { | |
243 | ||
244 | template < typename T1, typename T2 > | |
245 | struct is_same | |
246 | { | |
247 | static const bool value = false; | |
248 | }; | |
249 | ||
250 | template < typename T > | |
251 | struct is_same<T, T> | |
252 | { | |
253 | static const bool value = true; | |
254 | }; | |
255 | ||
256 | template < typename T1, typename T2 > | |
257 | auto | |
258 | add(T1 a1, T2 a2) -> decltype(a1 + a2) | |
259 | { | |
260 | return a1 + a2; | |
261 | } | |
262 | ||
263 | int | |
264 | test(const int c, volatile int v) | |
265 | { | |
266 | static_assert(is_same<int, decltype(0)>::value == true, ""); | |
267 | static_assert(is_same<int, decltype(c)>::value == false, ""); | |
268 | static_assert(is_same<int, decltype(v)>::value == false, ""); | |
269 | auto ac = c; | |
270 | auto av = v; | |
271 | auto sumi = ac + av + 'x'; | |
272 | auto sumf = ac + av + 1.0; | |
273 | static_assert(is_same<int, decltype(ac)>::value == true, ""); | |
274 | static_assert(is_same<int, decltype(av)>::value == true, ""); | |
275 | static_assert(is_same<int, decltype(sumi)>::value == true, ""); | |
276 | static_assert(is_same<int, decltype(sumf)>::value == false, ""); | |
277 | static_assert(is_same<int, decltype(add(c, v))>::value == true, ""); | |
278 | return (sumf > 0.0) ? sumi : add(c, v); | |
279 | } | |
280 | ||
281 | } | |
282 | ||
283 | namespace test_noexcept | |
284 | { | |
285 | ||
286 | int f() { return 0; } | |
287 | int g() noexcept { return 0; } | |
288 | ||
289 | static_assert(noexcept(f()) == false, ""); | |
290 | static_assert(noexcept(g()) == true, ""); | |
291 | ||
292 | } | |
293 | ||
294 | namespace test_constexpr | |
295 | { | |
296 | ||
297 | template < typename CharT > | |
298 | unsigned long constexpr | |
299 | strlen_c_r(const CharT *const s, const unsigned long acc) noexcept | |
300 | { | |
301 | return *s ? strlen_c_r(s + 1, acc + 1) : acc; | |
302 | } | |
303 | ||
304 | template < typename CharT > | |
305 | unsigned long constexpr | |
306 | strlen_c(const CharT *const s) noexcept | |
307 | { | |
308 | return strlen_c_r(s, 0UL); | |
309 | } | |
310 | ||
311 | static_assert(strlen_c("") == 0UL, ""); | |
312 | static_assert(strlen_c("1") == 1UL, ""); | |
313 | static_assert(strlen_c("example") == 7UL, ""); | |
314 | static_assert(strlen_c("another\0example") == 7UL, ""); | |
315 | ||
316 | } | |
317 | ||
318 | namespace test_rvalue_references | |
319 | { | |
320 | ||
321 | template < int N > | |
322 | struct answer | |
323 | { | |
324 | static constexpr int value = N; | |
325 | }; | |
326 | ||
327 | answer<1> f(int&) { return answer<1>(); } | |
328 | answer<2> f(const int&) { return answer<2>(); } | |
329 | answer<3> f(int&&) { return answer<3>(); } | |
330 | ||
331 | void | |
332 | test() | |
333 | { | |
334 | int i = 0; | |
335 | const int c = 0; | |
336 | static_assert(decltype(f(i))::value == 1, ""); | |
337 | static_assert(decltype(f(c))::value == 2, ""); | |
338 | static_assert(decltype(f(0))::value == 3, ""); | |
339 | } | |
340 | ||
341 | } | |
342 | ||
343 | namespace test_uniform_initialization | |
344 | { | |
345 | ||
346 | struct test | |
347 | { | |
348 | static const int zero {}; | |
349 | static const int one {1}; | |
350 | }; | |
351 | ||
352 | static_assert(test::zero == 0, ""); | |
353 | static_assert(test::one == 1, ""); | |
354 | ||
355 | } | |
356 | ||
357 | namespace test_lambdas | |
358 | { | |
359 | ||
360 | void | |
361 | test1() | |
362 | { | |
363 | auto lambda1 = [](){}; | |
364 | auto lambda2 = lambda1; | |
365 | lambda1(); | |
366 | lambda2(); | |
367 | } | |
368 | ||
369 | int | |
370 | test2() | |
371 | { | |
372 | auto a = [](int i, int j){ return i + j; }(1, 2); | |
373 | auto b = []() -> int { return '0'; }(); | |
374 | auto c = [=](){ return a + b; }(); | |
375 | auto d = [&](){ return c; }(); | |
376 | auto e = [a, &b](int x) mutable { | |
377 | const auto identity = [](int y){ return y; }; | |
378 | for (auto i = 0; i < a; ++i) | |
379 | a += b--; | |
380 | return x + identity(a + b); | |
381 | }(0); | |
382 | return a + b + c + d + e; | |
383 | } | |
384 | ||
385 | int | |
386 | test3() | |
387 | { | |
388 | const auto nullary = [](){ return 0; }; | |
389 | const auto unary = [](int x){ return x; }; | |
390 | using nullary_t = decltype(nullary); | |
391 | using unary_t = decltype(unary); | |
392 | const auto higher1st = [](nullary_t f){ return f(); }; | |
393 | const auto higher2nd = [unary](nullary_t f1){ | |
394 | return [unary, f1](unary_t f2){ return f2(unary(f1())); }; | |
395 | }; | |
396 | return higher1st(nullary) + higher2nd(nullary)(unary); | |
397 | } | |
398 | ||
399 | } | |
400 | ||
401 | namespace test_variadic_templates | |
402 | { | |
403 | ||
404 | template <int...> | |
405 | struct sum; | |
406 | ||
407 | template <int N0, int... N1toN> | |
408 | struct sum<N0, N1toN...> | |
409 | { | |
410 | static constexpr auto value = N0 + sum<N1toN...>::value; | |
411 | }; | |
412 | ||
413 | template <> | |
414 | struct sum<> | |
415 | { | |
416 | static constexpr auto value = 0; | |
417 | }; | |
418 | ||
419 | static_assert(sum<>::value == 0, ""); | |
420 | static_assert(sum<1>::value == 1, ""); | |
421 | static_assert(sum<23>::value == 23, ""); | |
422 | static_assert(sum<1, 2>::value == 3, ""); | |
423 | static_assert(sum<5, 5, 11>::value == 21, ""); | |
424 | static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); | |
425 | ||
426 | } | |
427 | ||
428 | // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae | |
429 | // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function | |
430 | // because of this. | |
431 | namespace test_template_alias_sfinae | |
432 | { | |
433 | ||
434 | struct foo {}; | |
435 | ||
436 | template<typename T> | |
437 | using member = typename T::member_type; | |
438 | ||
439 | template<typename T> | |
440 | void func(...) {} | |
441 | ||
442 | template<typename T> | |
443 | void func(member<T>*) {} | |
444 | ||
445 | void test(); | |
446 | ||
447 | void test() { func<foo>(0); } | |
448 | ||
449 | } | |
450 | ||
451 | } // namespace cxx11 | |
452 | ||
453 | #endif // __cplusplus >= 201103L | |
454 | ||
455 | ]]) | |
456 | ||
457 | ||
458 | dnl Tests for new features in C++14 | |
459 | ||
460 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[ | |
461 | ||
462 | // If the compiler admits that it is not ready for C++14, why torture it? | |
463 | // Hopefully, this will speed up the test. | |
464 | ||
465 | #ifndef __cplusplus | |
466 | ||
467 | #error "This is not a C++ compiler" | |
468 | ||
469 | #elif __cplusplus < 201402L | |
470 | ||
471 | #error "This is not a C++14 compiler" | |
472 | ||
473 | #else | |
474 | ||
475 | namespace cxx14 | |
476 | { | |
477 | ||
478 | namespace test_polymorphic_lambdas | |
479 | { | |
480 | ||
481 | int | |
482 | test() | |
483 | { | |
484 | const auto lambda = [](auto&&... args){ | |
485 | const auto istiny = [](auto x){ | |
486 | return (sizeof(x) == 1UL) ? 1 : 0; | |
487 | }; | |
488 | const int aretiny[] = { istiny(args)... }; | |
489 | return aretiny[0]; | |
490 | }; | |
491 | return lambda(1, 1L, 1.0f, '1'); | |
492 | } | |
493 | ||
494 | } | |
495 | ||
496 | namespace test_binary_literals | |
497 | { | |
498 | ||
499 | constexpr auto ivii = 0b0000000000101010; | |
500 | static_assert(ivii == 42, "wrong value"); | |
501 | ||
502 | } | |
503 | ||
504 | namespace test_generalized_constexpr | |
505 | { | |
506 | ||
507 | template < typename CharT > | |
508 | constexpr unsigned long | |
509 | strlen_c(const CharT *const s) noexcept | |
510 | { | |
511 | auto length = 0UL; | |
512 | for (auto p = s; *p; ++p) | |
513 | ++length; | |
514 | return length; | |
515 | } | |
516 | ||
517 | static_assert(strlen_c("") == 0UL, ""); | |
518 | static_assert(strlen_c("x") == 1UL, ""); | |
519 | static_assert(strlen_c("test") == 4UL, ""); | |
520 | static_assert(strlen_c("another\0test") == 7UL, ""); | |
521 | ||
522 | } | |
523 | ||
524 | namespace test_lambda_init_capture | |
525 | { | |
526 | ||
527 | int | |
528 | test() | |
529 | { | |
530 | auto x = 0; | |
531 | const auto lambda1 = [a = x](int b){ return a + b; }; | |
532 | const auto lambda2 = [a = lambda1(x)](){ return a; }; | |
533 | return lambda2(); | |
534 | } | |
535 | ||
536 | } | |
537 | ||
41260ac2 | 538 | namespace test_digit_separators |
87106a7b PA |
539 | { |
540 | ||
541 | constexpr auto ten_million = 100'000'000; | |
542 | static_assert(ten_million == 100000000, ""); | |
543 | ||
544 | } | |
545 | ||
546 | namespace test_return_type_deduction | |
547 | { | |
548 | ||
549 | auto f(int& x) { return x; } | |
550 | decltype(auto) g(int& x) { return x; } | |
551 | ||
552 | template < typename T1, typename T2 > | |
553 | struct is_same | |
554 | { | |
555 | static constexpr auto value = false; | |
556 | }; | |
557 | ||
558 | template < typename T > | |
559 | struct is_same<T, T> | |
560 | { | |
561 | static constexpr auto value = true; | |
562 | }; | |
563 | ||
564 | int | |
565 | test() | |
566 | { | |
567 | auto x = 0; | |
568 | static_assert(is_same<int, decltype(f(x))>::value, ""); | |
569 | static_assert(is_same<int&, decltype(g(x))>::value, ""); | |
570 | return x; | |
571 | } | |
572 | ||
573 | } | |
574 | ||
575 | } // namespace cxx14 | |
576 | ||
577 | #endif // __cplusplus >= 201402L | |
578 | ||
579 | ]]) | |
41260ac2 SM |
580 | |
581 | ||
582 | dnl Tests for new features in C++17 | |
583 | ||
584 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[ | |
585 | ||
586 | // If the compiler admits that it is not ready for C++17, why torture it? | |
587 | // Hopefully, this will speed up the test. | |
588 | ||
589 | #ifndef __cplusplus | |
590 | ||
591 | #error "This is not a C++ compiler" | |
592 | ||
593 | #elif __cplusplus <= 201402L | |
594 | ||
595 | #error "This is not a C++17 compiler" | |
596 | ||
597 | #else | |
598 | ||
599 | #if defined(__clang__) | |
600 | #define REALLY_CLANG | |
601 | #else | |
602 | #if defined(__GNUC__) | |
603 | #define REALLY_GCC | |
604 | #endif | |
605 | #endif | |
606 | ||
607 | #include <initializer_list> | |
608 | #include <utility> | |
609 | #include <type_traits> | |
610 | ||
611 | namespace cxx17 | |
612 | { | |
613 | ||
614 | #if !defined(REALLY_CLANG) | |
615 | namespace test_constexpr_lambdas | |
616 | { | |
617 | ||
618 | // TODO: test it with clang++ from git | |
619 | ||
620 | constexpr int foo = [](){return 42;}(); | |
621 | ||
622 | } | |
623 | #endif // !defined(REALLY_CLANG) | |
624 | ||
625 | namespace test::nested_namespace::definitions | |
626 | { | |
627 | ||
628 | } | |
629 | ||
630 | namespace test_fold_expression | |
631 | { | |
632 | ||
633 | template<typename... Args> | |
634 | int multiply(Args... args) | |
635 | { | |
636 | return (args * ... * 1); | |
637 | } | |
638 | ||
639 | template<typename... Args> | |
640 | bool all(Args... args) | |
641 | { | |
642 | return (args && ...); | |
643 | } | |
644 | ||
645 | } | |
646 | ||
647 | namespace test_extended_static_assert | |
648 | { | |
649 | ||
650 | static_assert (true); | |
651 | ||
652 | } | |
653 | ||
654 | namespace test_auto_brace_init_list | |
655 | { | |
656 | ||
657 | auto foo = {5}; | |
658 | auto bar {5}; | |
659 | ||
660 | static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value); | |
661 | static_assert(std::is_same<int, decltype(bar)>::value); | |
662 | } | |
663 | ||
664 | namespace test_typename_in_template_template_parameter | |
665 | { | |
666 | ||
667 | template<template<typename> typename X> struct D; | |
668 | ||
669 | } | |
670 | ||
671 | namespace test_fallthrough_nodiscard_maybe_unused_attributes | |
672 | { | |
673 | ||
674 | int f1() | |
675 | { | |
676 | return 42; | |
677 | } | |
678 | ||
679 | [[nodiscard]] int f2() | |
680 | { | |
681 | [[maybe_unused]] auto unused = f1(); | |
682 | ||
683 | switch (f1()) | |
684 | { | |
685 | case 17: | |
686 | f1(); | |
687 | [[fallthrough]]; | |
688 | case 42: | |
689 | f1(); | |
690 | } | |
691 | return f1(); | |
692 | } | |
693 | ||
694 | } | |
695 | ||
696 | namespace test_extended_aggregate_initialization | |
697 | { | |
698 | ||
699 | struct base1 | |
700 | { | |
701 | int b1, b2 = 42; | |
702 | }; | |
703 | ||
704 | struct base2 | |
705 | { | |
706 | base2() { | |
707 | b3 = 42; | |
708 | } | |
709 | int b3; | |
710 | }; | |
711 | ||
712 | struct derived : base1, base2 | |
713 | { | |
714 | int d; | |
715 | }; | |
716 | ||
717 | derived d1 {{1, 2}, {}, 4}; // full initialization | |
718 | derived d2 {{}, {}, 4}; // value-initialized bases | |
719 | ||
720 | } | |
721 | ||
722 | namespace test_general_range_based_for_loop | |
723 | { | |
724 | ||
725 | struct iter | |
726 | { | |
727 | int i; | |
728 | ||
729 | int& operator* () | |
730 | { | |
731 | return i; | |
732 | } | |
733 | ||
734 | const int& operator* () const | |
735 | { | |
736 | return i; | |
737 | } | |
738 | ||
739 | iter& operator++() | |
740 | { | |
741 | ++i; | |
742 | return *this; | |
743 | } | |
744 | }; | |
745 | ||
746 | struct sentinel | |
747 | { | |
748 | int i; | |
749 | }; | |
750 | ||
751 | bool operator== (const iter& i, const sentinel& s) | |
752 | { | |
753 | return i.i == s.i; | |
754 | } | |
755 | ||
756 | bool operator!= (const iter& i, const sentinel& s) | |
757 | { | |
758 | return !(i == s); | |
759 | } | |
760 | ||
761 | struct range | |
762 | { | |
763 | iter begin() const | |
764 | { | |
765 | return {0}; | |
766 | } | |
767 | ||
768 | sentinel end() const | |
769 | { | |
770 | return {5}; | |
771 | } | |
772 | }; | |
773 | ||
774 | void f() | |
775 | { | |
776 | range r {}; | |
777 | ||
778 | for (auto i : r) | |
779 | { | |
780 | [[maybe_unused]] auto v = i; | |
781 | } | |
782 | } | |
783 | ||
784 | } | |
785 | ||
786 | namespace test_lambda_capture_asterisk_this_by_value | |
787 | { | |
788 | ||
789 | struct t | |
790 | { | |
791 | int i; | |
792 | int foo() | |
793 | { | |
794 | return [*this]() | |
795 | { | |
796 | return i; | |
797 | }(); | |
798 | } | |
799 | }; | |
800 | ||
801 | } | |
802 | ||
803 | namespace test_enum_class_construction | |
804 | { | |
805 | ||
806 | enum class byte : unsigned char | |
807 | {}; | |
808 | ||
809 | byte foo {42}; | |
810 | ||
811 | } | |
812 | ||
813 | namespace test_constexpr_if | |
814 | { | |
815 | ||
816 | template <bool cond> | |
817 | int f () | |
818 | { | |
819 | if constexpr(cond) | |
820 | { | |
821 | return 13; | |
822 | } | |
823 | else | |
824 | { | |
825 | return 42; | |
826 | } | |
827 | } | |
828 | ||
829 | } | |
830 | ||
831 | namespace test_selection_statement_with_initializer | |
832 | { | |
833 | ||
834 | int f() | |
835 | { | |
836 | return 13; | |
837 | } | |
838 | ||
839 | int f2() | |
840 | { | |
841 | if (auto i = f(); i > 0) | |
842 | { | |
843 | return 3; | |
844 | } | |
845 | ||
846 | switch (auto i = f(); i + 4) | |
847 | { | |
848 | case 17: | |
849 | return 2; | |
850 | ||
851 | default: | |
852 | return 1; | |
853 | } | |
854 | } | |
855 | ||
856 | } | |
857 | ||
858 | #if !defined(REALLY_CLANG) | |
859 | namespace test_template_argument_deduction_for_class_templates | |
860 | { | |
861 | ||
862 | // TODO: test it with clang++ from git | |
863 | ||
864 | template <typename T1, typename T2> | |
865 | struct pair | |
866 | { | |
867 | pair (T1 p1, T2 p2) | |
868 | : m1 {p1}, | |
869 | m2 {p2} | |
870 | {} | |
871 | ||
872 | T1 m1; | |
873 | T2 m2; | |
874 | }; | |
875 | ||
876 | void f() | |
877 | { | |
878 | [[maybe_unused]] auto p = pair{13, 42u}; | |
879 | } | |
880 | ||
881 | } | |
882 | #endif // !defined(REALLY_CLANG) | |
883 | ||
884 | namespace test_non_type_auto_template_parameters | |
885 | { | |
886 | ||
887 | template <auto n> | |
888 | struct B | |
889 | {}; | |
890 | ||
891 | B<5> b1; | |
892 | B<'a'> b2; | |
893 | ||
894 | } | |
895 | ||
896 | #if !defined(REALLY_CLANG) | |
897 | namespace test_structured_bindings | |
898 | { | |
899 | ||
900 | // TODO: test it with clang++ from git | |
901 | ||
902 | int arr[2] = { 1, 2 }; | |
903 | std::pair<int, int> pr = { 1, 2 }; | |
904 | ||
905 | auto f1() -> int(&)[2] | |
906 | { | |
907 | return arr; | |
908 | } | |
909 | ||
910 | auto f2() -> std::pair<int, int>& | |
911 | { | |
912 | return pr; | |
913 | } | |
914 | ||
915 | struct S | |
916 | { | |
917 | int x1 : 2; | |
918 | volatile double y1; | |
919 | }; | |
920 | ||
921 | S f3() | |
922 | { | |
923 | return {}; | |
924 | } | |
925 | ||
926 | auto [ x1, y1 ] = f1(); | |
927 | auto& [ xr1, yr1 ] = f1(); | |
928 | auto [ x2, y2 ] = f2(); | |
929 | auto& [ xr2, yr2 ] = f2(); | |
930 | const auto [ x3, y3 ] = f3(); | |
931 | ||
932 | } | |
933 | #endif // !defined(REALLY_CLANG) | |
934 | ||
935 | #if !defined(REALLY_CLANG) | |
936 | namespace test_exception_spec_type_system | |
937 | { | |
938 | ||
939 | // TODO: test it with clang++ from git | |
940 | ||
941 | struct Good {}; | |
942 | struct Bad {}; | |
943 | ||
944 | void g1() noexcept; | |
945 | void g2(); | |
946 | ||
947 | template<typename T> | |
948 | Bad | |
949 | f(T*, T*); | |
950 | ||
951 | template<typename T1, typename T2> | |
952 | Good | |
953 | f(T1*, T2*); | |
954 | ||
955 | static_assert (std::is_same_v<Good, decltype(f(g1, g2))>); | |
956 | ||
957 | } | |
958 | #endif // !defined(REALLY_CLANG) | |
959 | ||
960 | namespace test_inline_variables | |
961 | { | |
962 | ||
963 | template<class T> void f(T) | |
964 | {} | |
965 | ||
966 | template<class T> inline T g(T) | |
967 | { | |
968 | return T{}; | |
969 | } | |
970 | ||
971 | template<> inline void f<>(int) | |
972 | {} | |
973 | ||
974 | template<> int g<>(int) | |
975 | { | |
976 | return 5; | |
977 | } | |
978 | ||
979 | } | |
980 | ||
981 | } // namespace cxx17 | |
982 | ||
983 | #endif // __cplusplus <= 201402L | |
984 | ||
985 | ]]) |