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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="$switch" |
9b4d030e TV |
97 | CXX="$CXX $switch" |
98 | if test -n "$CXXCPP" ; then | |
99 | CXXCPP="$CXXCPP $switch" | |
100 | fi | |
87106a7b PA |
101 | ac_success=yes |
102 | break | |
103 | fi | |
104 | done | |
105 | fi]) | |
106 | ||
107 | m4_if([$2], [ext], [], [dnl | |
108 | if test x$ac_success = xno; then | |
109 | dnl HP's aCC needs +std=c++11 according to: | |
110 | dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf | |
111 | dnl Cray's crayCC needs "-h std=c++11" | |
41260ac2 SM |
112 | for alternative in ${ax_cxx_compile_alternatives}; do |
113 | for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do | |
114 | cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) | |
115 | AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, | |
116 | $cachevar, | |
117 | [ac_save_CXX="$CXX" | |
118 | CXX="$CXX $switch" | |
119 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], | |
120 | [eval $cachevar=yes], | |
121 | [eval $cachevar=no]) | |
122 | CXX="$ac_save_CXX"]) | |
123 | if eval test x\$$cachevar = xyes; then | |
124 | CXX_DIALECT="$switch" | |
9b4d030e TV |
125 | CXX="$CXX $switch" |
126 | if test -n "$CXXCPP" ; then | |
127 | CXXCPP="$CXXCPP $switch" | |
128 | fi | |
41260ac2 SM |
129 | ac_success=yes |
130 | break | |
131 | fi | |
132 | done | |
133 | if test x$ac_success = xyes; then | |
87106a7b PA |
134 | break |
135 | fi | |
136 | done | |
137 | fi]) | |
138 | AC_LANG_POP([C++]) | |
139 | if test x$ax_cxx_compile_cxx$1_required = xtrue; then | |
140 | if test x$ac_success = xno; then | |
141 | AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.]) | |
142 | fi | |
143 | fi | |
144 | if test x$ac_success = xno; then | |
145 | HAVE_CXX$1=0 | |
146 | AC_MSG_NOTICE([No compiler with C++$1 support was found]) | |
147 | else | |
148 | HAVE_CXX$1=1 | |
149 | AC_DEFINE(HAVE_CXX$1,1, | |
150 | [define if the compiler supports basic C++$1 syntax]) | |
151 | fi | |
152 | AC_SUBST(HAVE_CXX$1) | |
0bcda685 | 153 | AC_SUBST(CXX_DIALECT) |
87106a7b PA |
154 | ]) |
155 | ||
156 | ||
157 | dnl Test body for checking C++11 support | |
158 | ||
159 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11], | |
160 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 | |
161 | ) | |
162 | ||
163 | ||
164 | dnl Test body for checking C++14 support | |
165 | ||
166 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14], | |
167 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 | |
168 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 | |
169 | ) | |
170 | ||
41260ac2 SM |
171 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17], |
172 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 | |
173 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 | |
174 | _AX_CXX_COMPILE_STDCXX_testbody_new_in_17 | |
175 | ) | |
87106a7b PA |
176 | |
177 | dnl Tests for new features in C++11 | |
178 | ||
179 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[ | |
180 | ||
181 | // If the compiler admits that it is not ready for C++11, why torture it? | |
182 | // Hopefully, this will speed up the test. | |
183 | ||
184 | #ifndef __cplusplus | |
185 | ||
186 | #error "This is not a C++ compiler" | |
187 | ||
188 | #elif __cplusplus < 201103L | |
189 | ||
190 | #error "This is not a C++11 compiler" | |
191 | ||
192 | #else | |
193 | ||
194 | namespace cxx11 | |
195 | { | |
196 | ||
197 | namespace test_static_assert | |
198 | { | |
199 | ||
200 | template <typename T> | |
201 | struct check | |
202 | { | |
203 | static_assert(sizeof(int) <= sizeof(T), "not big enough"); | |
204 | }; | |
205 | ||
206 | } | |
207 | ||
208 | namespace test_final_override | |
209 | { | |
210 | ||
211 | struct Base | |
212 | { | |
213 | virtual void f() {} | |
214 | }; | |
215 | ||
216 | struct Derived : public Base | |
217 | { | |
218 | virtual void f() override {} | |
219 | }; | |
220 | ||
221 | } | |
222 | ||
223 | namespace test_double_right_angle_brackets | |
224 | { | |
225 | ||
226 | template < typename T > | |
227 | struct check {}; | |
228 | ||
229 | typedef check<void> single_type; | |
230 | typedef check<check<void>> double_type; | |
231 | typedef check<check<check<void>>> triple_type; | |
232 | typedef check<check<check<check<void>>>> quadruple_type; | |
233 | ||
234 | } | |
235 | ||
236 | namespace test_decltype | |
237 | { | |
238 | ||
239 | int | |
240 | f() | |
241 | { | |
242 | int a = 1; | |
243 | decltype(a) b = 2; | |
244 | return a + b; | |
245 | } | |
246 | ||
247 | } | |
248 | ||
249 | namespace test_type_deduction | |
250 | { | |
251 | ||
252 | template < typename T1, typename T2 > | |
253 | struct is_same | |
254 | { | |
255 | static const bool value = false; | |
256 | }; | |
257 | ||
258 | template < typename T > | |
259 | struct is_same<T, T> | |
260 | { | |
261 | static const bool value = true; | |
262 | }; | |
263 | ||
264 | template < typename T1, typename T2 > | |
265 | auto | |
266 | add(T1 a1, T2 a2) -> decltype(a1 + a2) | |
267 | { | |
268 | return a1 + a2; | |
269 | } | |
270 | ||
271 | int | |
272 | test(const int c, volatile int v) | |
273 | { | |
274 | static_assert(is_same<int, decltype(0)>::value == true, ""); | |
275 | static_assert(is_same<int, decltype(c)>::value == false, ""); | |
276 | static_assert(is_same<int, decltype(v)>::value == false, ""); | |
277 | auto ac = c; | |
278 | auto av = v; | |
279 | auto sumi = ac + av + 'x'; | |
280 | auto sumf = ac + av + 1.0; | |
281 | static_assert(is_same<int, decltype(ac)>::value == true, ""); | |
282 | static_assert(is_same<int, decltype(av)>::value == true, ""); | |
283 | static_assert(is_same<int, decltype(sumi)>::value == true, ""); | |
284 | static_assert(is_same<int, decltype(sumf)>::value == false, ""); | |
285 | static_assert(is_same<int, decltype(add(c, v))>::value == true, ""); | |
286 | return (sumf > 0.0) ? sumi : add(c, v); | |
287 | } | |
288 | ||
289 | } | |
290 | ||
291 | namespace test_noexcept | |
292 | { | |
293 | ||
294 | int f() { return 0; } | |
295 | int g() noexcept { return 0; } | |
296 | ||
297 | static_assert(noexcept(f()) == false, ""); | |
298 | static_assert(noexcept(g()) == true, ""); | |
299 | ||
300 | } | |
301 | ||
302 | namespace test_constexpr | |
303 | { | |
304 | ||
305 | template < typename CharT > | |
306 | unsigned long constexpr | |
307 | strlen_c_r(const CharT *const s, const unsigned long acc) noexcept | |
308 | { | |
309 | return *s ? strlen_c_r(s + 1, acc + 1) : acc; | |
310 | } | |
311 | ||
312 | template < typename CharT > | |
313 | unsigned long constexpr | |
314 | strlen_c(const CharT *const s) noexcept | |
315 | { | |
316 | return strlen_c_r(s, 0UL); | |
317 | } | |
318 | ||
319 | static_assert(strlen_c("") == 0UL, ""); | |
320 | static_assert(strlen_c("1") == 1UL, ""); | |
321 | static_assert(strlen_c("example") == 7UL, ""); | |
322 | static_assert(strlen_c("another\0example") == 7UL, ""); | |
323 | ||
324 | } | |
325 | ||
326 | namespace test_rvalue_references | |
327 | { | |
328 | ||
329 | template < int N > | |
330 | struct answer | |
331 | { | |
332 | static constexpr int value = N; | |
333 | }; | |
334 | ||
335 | answer<1> f(int&) { return answer<1>(); } | |
336 | answer<2> f(const int&) { return answer<2>(); } | |
337 | answer<3> f(int&&) { return answer<3>(); } | |
338 | ||
339 | void | |
340 | test() | |
341 | { | |
342 | int i = 0; | |
343 | const int c = 0; | |
344 | static_assert(decltype(f(i))::value == 1, ""); | |
345 | static_assert(decltype(f(c))::value == 2, ""); | |
346 | static_assert(decltype(f(0))::value == 3, ""); | |
347 | } | |
348 | ||
349 | } | |
350 | ||
351 | namespace test_uniform_initialization | |
352 | { | |
353 | ||
354 | struct test | |
355 | { | |
356 | static const int zero {}; | |
357 | static const int one {1}; | |
358 | }; | |
359 | ||
360 | static_assert(test::zero == 0, ""); | |
361 | static_assert(test::one == 1, ""); | |
362 | ||
363 | } | |
364 | ||
365 | namespace test_lambdas | |
366 | { | |
367 | ||
368 | void | |
369 | test1() | |
370 | { | |
371 | auto lambda1 = [](){}; | |
372 | auto lambda2 = lambda1; | |
373 | lambda1(); | |
374 | lambda2(); | |
375 | } | |
376 | ||
377 | int | |
378 | test2() | |
379 | { | |
380 | auto a = [](int i, int j){ return i + j; }(1, 2); | |
381 | auto b = []() -> int { return '0'; }(); | |
382 | auto c = [=](){ return a + b; }(); | |
383 | auto d = [&](){ return c; }(); | |
384 | auto e = [a, &b](int x) mutable { | |
385 | const auto identity = [](int y){ return y; }; | |
386 | for (auto i = 0; i < a; ++i) | |
387 | a += b--; | |
388 | return x + identity(a + b); | |
389 | }(0); | |
390 | return a + b + c + d + e; | |
391 | } | |
392 | ||
393 | int | |
394 | test3() | |
395 | { | |
396 | const auto nullary = [](){ return 0; }; | |
397 | const auto unary = [](int x){ return x; }; | |
398 | using nullary_t = decltype(nullary); | |
399 | using unary_t = decltype(unary); | |
400 | const auto higher1st = [](nullary_t f){ return f(); }; | |
401 | const auto higher2nd = [unary](nullary_t f1){ | |
402 | return [unary, f1](unary_t f2){ return f2(unary(f1())); }; | |
403 | }; | |
404 | return higher1st(nullary) + higher2nd(nullary)(unary); | |
405 | } | |
406 | ||
407 | } | |
408 | ||
409 | namespace test_variadic_templates | |
410 | { | |
411 | ||
412 | template <int...> | |
413 | struct sum; | |
414 | ||
415 | template <int N0, int... N1toN> | |
416 | struct sum<N0, N1toN...> | |
417 | { | |
418 | static constexpr auto value = N0 + sum<N1toN...>::value; | |
419 | }; | |
420 | ||
421 | template <> | |
422 | struct sum<> | |
423 | { | |
424 | static constexpr auto value = 0; | |
425 | }; | |
426 | ||
427 | static_assert(sum<>::value == 0, ""); | |
428 | static_assert(sum<1>::value == 1, ""); | |
429 | static_assert(sum<23>::value == 23, ""); | |
430 | static_assert(sum<1, 2>::value == 3, ""); | |
431 | static_assert(sum<5, 5, 11>::value == 21, ""); | |
432 | static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); | |
433 | ||
434 | } | |
435 | ||
436 | // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae | |
437 | // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function | |
438 | // because of this. | |
439 | namespace test_template_alias_sfinae | |
440 | { | |
441 | ||
442 | struct foo {}; | |
443 | ||
444 | template<typename T> | |
445 | using member = typename T::member_type; | |
446 | ||
447 | template<typename T> | |
448 | void func(...) {} | |
449 | ||
450 | template<typename T> | |
451 | void func(member<T>*) {} | |
452 | ||
453 | void test(); | |
454 | ||
455 | void test() { func<foo>(0); } | |
456 | ||
457 | } | |
458 | ||
459 | } // namespace cxx11 | |
460 | ||
461 | #endif // __cplusplus >= 201103L | |
462 | ||
463 | ]]) | |
464 | ||
465 | ||
466 | dnl Tests for new features in C++14 | |
467 | ||
468 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[ | |
469 | ||
470 | // If the compiler admits that it is not ready for C++14, why torture it? | |
471 | // Hopefully, this will speed up the test. | |
472 | ||
473 | #ifndef __cplusplus | |
474 | ||
475 | #error "This is not a C++ compiler" | |
476 | ||
477 | #elif __cplusplus < 201402L | |
478 | ||
479 | #error "This is not a C++14 compiler" | |
480 | ||
481 | #else | |
482 | ||
483 | namespace cxx14 | |
484 | { | |
485 | ||
486 | namespace test_polymorphic_lambdas | |
487 | { | |
488 | ||
489 | int | |
490 | test() | |
491 | { | |
492 | const auto lambda = [](auto&&... args){ | |
493 | const auto istiny = [](auto x){ | |
494 | return (sizeof(x) == 1UL) ? 1 : 0; | |
495 | }; | |
496 | const int aretiny[] = { istiny(args)... }; | |
497 | return aretiny[0]; | |
498 | }; | |
499 | return lambda(1, 1L, 1.0f, '1'); | |
500 | } | |
501 | ||
502 | } | |
503 | ||
504 | namespace test_binary_literals | |
505 | { | |
506 | ||
507 | constexpr auto ivii = 0b0000000000101010; | |
508 | static_assert(ivii == 42, "wrong value"); | |
509 | ||
510 | } | |
511 | ||
512 | namespace test_generalized_constexpr | |
513 | { | |
514 | ||
515 | template < typename CharT > | |
516 | constexpr unsigned long | |
517 | strlen_c(const CharT *const s) noexcept | |
518 | { | |
519 | auto length = 0UL; | |
520 | for (auto p = s; *p; ++p) | |
521 | ++length; | |
522 | return length; | |
523 | } | |
524 | ||
525 | static_assert(strlen_c("") == 0UL, ""); | |
526 | static_assert(strlen_c("x") == 1UL, ""); | |
527 | static_assert(strlen_c("test") == 4UL, ""); | |
528 | static_assert(strlen_c("another\0test") == 7UL, ""); | |
529 | ||
530 | } | |
531 | ||
532 | namespace test_lambda_init_capture | |
533 | { | |
534 | ||
535 | int | |
536 | test() | |
537 | { | |
538 | auto x = 0; | |
539 | const auto lambda1 = [a = x](int b){ return a + b; }; | |
540 | const auto lambda2 = [a = lambda1(x)](){ return a; }; | |
541 | return lambda2(); | |
542 | } | |
543 | ||
544 | } | |
545 | ||
41260ac2 | 546 | namespace test_digit_separators |
87106a7b PA |
547 | { |
548 | ||
549 | constexpr auto ten_million = 100'000'000; | |
550 | static_assert(ten_million == 100000000, ""); | |
551 | ||
552 | } | |
553 | ||
554 | namespace test_return_type_deduction | |
555 | { | |
556 | ||
557 | auto f(int& x) { return x; } | |
558 | decltype(auto) g(int& x) { return x; } | |
559 | ||
560 | template < typename T1, typename T2 > | |
561 | struct is_same | |
562 | { | |
563 | static constexpr auto value = false; | |
564 | }; | |
565 | ||
566 | template < typename T > | |
567 | struct is_same<T, T> | |
568 | { | |
569 | static constexpr auto value = true; | |
570 | }; | |
571 | ||
572 | int | |
573 | test() | |
574 | { | |
575 | auto x = 0; | |
576 | static_assert(is_same<int, decltype(f(x))>::value, ""); | |
577 | static_assert(is_same<int&, decltype(g(x))>::value, ""); | |
578 | return x; | |
579 | } | |
580 | ||
581 | } | |
582 | ||
583 | } // namespace cxx14 | |
584 | ||
585 | #endif // __cplusplus >= 201402L | |
586 | ||
587 | ]]) | |
41260ac2 SM |
588 | |
589 | ||
590 | dnl Tests for new features in C++17 | |
591 | ||
592 | m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[ | |
593 | ||
594 | // If the compiler admits that it is not ready for C++17, why torture it? | |
595 | // Hopefully, this will speed up the test. | |
596 | ||
597 | #ifndef __cplusplus | |
598 | ||
599 | #error "This is not a C++ compiler" | |
600 | ||
601 | #elif __cplusplus <= 201402L | |
602 | ||
603 | #error "This is not a C++17 compiler" | |
604 | ||
605 | #else | |
606 | ||
607 | #if defined(__clang__) | |
608 | #define REALLY_CLANG | |
609 | #else | |
610 | #if defined(__GNUC__) | |
611 | #define REALLY_GCC | |
612 | #endif | |
613 | #endif | |
614 | ||
615 | #include <initializer_list> | |
616 | #include <utility> | |
617 | #include <type_traits> | |
618 | ||
619 | namespace cxx17 | |
620 | { | |
621 | ||
622 | #if !defined(REALLY_CLANG) | |
623 | namespace test_constexpr_lambdas | |
624 | { | |
625 | ||
626 | // TODO: test it with clang++ from git | |
627 | ||
628 | constexpr int foo = [](){return 42;}(); | |
629 | ||
630 | } | |
631 | #endif // !defined(REALLY_CLANG) | |
632 | ||
633 | namespace test::nested_namespace::definitions | |
634 | { | |
635 | ||
636 | } | |
637 | ||
638 | namespace test_fold_expression | |
639 | { | |
640 | ||
641 | template<typename... Args> | |
642 | int multiply(Args... args) | |
643 | { | |
644 | return (args * ... * 1); | |
645 | } | |
646 | ||
647 | template<typename... Args> | |
648 | bool all(Args... args) | |
649 | { | |
650 | return (args && ...); | |
651 | } | |
652 | ||
653 | } | |
654 | ||
655 | namespace test_extended_static_assert | |
656 | { | |
657 | ||
658 | static_assert (true); | |
659 | ||
660 | } | |
661 | ||
662 | namespace test_auto_brace_init_list | |
663 | { | |
664 | ||
665 | auto foo = {5}; | |
666 | auto bar {5}; | |
667 | ||
668 | static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value); | |
669 | static_assert(std::is_same<int, decltype(bar)>::value); | |
670 | } | |
671 | ||
672 | namespace test_typename_in_template_template_parameter | |
673 | { | |
674 | ||
675 | template<template<typename> typename X> struct D; | |
676 | ||
677 | } | |
678 | ||
679 | namespace test_fallthrough_nodiscard_maybe_unused_attributes | |
680 | { | |
681 | ||
682 | int f1() | |
683 | { | |
684 | return 42; | |
685 | } | |
686 | ||
687 | [[nodiscard]] int f2() | |
688 | { | |
689 | [[maybe_unused]] auto unused = f1(); | |
690 | ||
691 | switch (f1()) | |
692 | { | |
693 | case 17: | |
694 | f1(); | |
695 | [[fallthrough]]; | |
696 | case 42: | |
697 | f1(); | |
698 | } | |
699 | return f1(); | |
700 | } | |
701 | ||
702 | } | |
703 | ||
704 | namespace test_extended_aggregate_initialization | |
705 | { | |
706 | ||
707 | struct base1 | |
708 | { | |
709 | int b1, b2 = 42; | |
710 | }; | |
711 | ||
712 | struct base2 | |
713 | { | |
714 | base2() { | |
715 | b3 = 42; | |
716 | } | |
717 | int b3; | |
718 | }; | |
719 | ||
720 | struct derived : base1, base2 | |
721 | { | |
722 | int d; | |
723 | }; | |
724 | ||
725 | derived d1 {{1, 2}, {}, 4}; // full initialization | |
726 | derived d2 {{}, {}, 4}; // value-initialized bases | |
727 | ||
728 | } | |
729 | ||
730 | namespace test_general_range_based_for_loop | |
731 | { | |
732 | ||
733 | struct iter | |
734 | { | |
735 | int i; | |
736 | ||
737 | int& operator* () | |
738 | { | |
739 | return i; | |
740 | } | |
741 | ||
742 | const int& operator* () const | |
743 | { | |
744 | return i; | |
745 | } | |
746 | ||
747 | iter& operator++() | |
748 | { | |
749 | ++i; | |
750 | return *this; | |
751 | } | |
752 | }; | |
753 | ||
754 | struct sentinel | |
755 | { | |
756 | int i; | |
757 | }; | |
758 | ||
759 | bool operator== (const iter& i, const sentinel& s) | |
760 | { | |
761 | return i.i == s.i; | |
762 | } | |
763 | ||
764 | bool operator!= (const iter& i, const sentinel& s) | |
765 | { | |
766 | return !(i == s); | |
767 | } | |
768 | ||
769 | struct range | |
770 | { | |
771 | iter begin() const | |
772 | { | |
773 | return {0}; | |
774 | } | |
775 | ||
776 | sentinel end() const | |
777 | { | |
778 | return {5}; | |
779 | } | |
780 | }; | |
781 | ||
782 | void f() | |
783 | { | |
784 | range r {}; | |
785 | ||
786 | for (auto i : r) | |
787 | { | |
788 | [[maybe_unused]] auto v = i; | |
789 | } | |
790 | } | |
791 | ||
792 | } | |
793 | ||
794 | namespace test_lambda_capture_asterisk_this_by_value | |
795 | { | |
796 | ||
797 | struct t | |
798 | { | |
799 | int i; | |
800 | int foo() | |
801 | { | |
802 | return [*this]() | |
803 | { | |
804 | return i; | |
805 | }(); | |
806 | } | |
807 | }; | |
808 | ||
809 | } | |
810 | ||
811 | namespace test_enum_class_construction | |
812 | { | |
813 | ||
814 | enum class byte : unsigned char | |
815 | {}; | |
816 | ||
817 | byte foo {42}; | |
818 | ||
819 | } | |
820 | ||
821 | namespace test_constexpr_if | |
822 | { | |
823 | ||
824 | template <bool cond> | |
825 | int f () | |
826 | { | |
827 | if constexpr(cond) | |
828 | { | |
829 | return 13; | |
830 | } | |
831 | else | |
832 | { | |
833 | return 42; | |
834 | } | |
835 | } | |
836 | ||
837 | } | |
838 | ||
839 | namespace test_selection_statement_with_initializer | |
840 | { | |
841 | ||
842 | int f() | |
843 | { | |
844 | return 13; | |
845 | } | |
846 | ||
847 | int f2() | |
848 | { | |
849 | if (auto i = f(); i > 0) | |
850 | { | |
851 | return 3; | |
852 | } | |
853 | ||
854 | switch (auto i = f(); i + 4) | |
855 | { | |
856 | case 17: | |
857 | return 2; | |
858 | ||
859 | default: | |
860 | return 1; | |
861 | } | |
862 | } | |
863 | ||
864 | } | |
865 | ||
866 | #if !defined(REALLY_CLANG) | |
867 | namespace test_template_argument_deduction_for_class_templates | |
868 | { | |
869 | ||
870 | // TODO: test it with clang++ from git | |
871 | ||
872 | template <typename T1, typename T2> | |
873 | struct pair | |
874 | { | |
875 | pair (T1 p1, T2 p2) | |
876 | : m1 {p1}, | |
877 | m2 {p2} | |
878 | {} | |
879 | ||
880 | T1 m1; | |
881 | T2 m2; | |
882 | }; | |
883 | ||
884 | void f() | |
885 | { | |
886 | [[maybe_unused]] auto p = pair{13, 42u}; | |
887 | } | |
888 | ||
889 | } | |
890 | #endif // !defined(REALLY_CLANG) | |
891 | ||
892 | namespace test_non_type_auto_template_parameters | |
893 | { | |
894 | ||
895 | template <auto n> | |
896 | struct B | |
897 | {}; | |
898 | ||
899 | B<5> b1; | |
900 | B<'a'> b2; | |
901 | ||
902 | } | |
903 | ||
904 | #if !defined(REALLY_CLANG) | |
905 | namespace test_structured_bindings | |
906 | { | |
907 | ||
908 | // TODO: test it with clang++ from git | |
909 | ||
910 | int arr[2] = { 1, 2 }; | |
911 | std::pair<int, int> pr = { 1, 2 }; | |
912 | ||
913 | auto f1() -> int(&)[2] | |
914 | { | |
915 | return arr; | |
916 | } | |
917 | ||
918 | auto f2() -> std::pair<int, int>& | |
919 | { | |
920 | return pr; | |
921 | } | |
922 | ||
923 | struct S | |
924 | { | |
925 | int x1 : 2; | |
926 | volatile double y1; | |
927 | }; | |
928 | ||
929 | S f3() | |
930 | { | |
931 | return {}; | |
932 | } | |
933 | ||
934 | auto [ x1, y1 ] = f1(); | |
935 | auto& [ xr1, yr1 ] = f1(); | |
936 | auto [ x2, y2 ] = f2(); | |
937 | auto& [ xr2, yr2 ] = f2(); | |
938 | const auto [ x3, y3 ] = f3(); | |
939 | ||
940 | } | |
941 | #endif // !defined(REALLY_CLANG) | |
942 | ||
943 | #if !defined(REALLY_CLANG) | |
944 | namespace test_exception_spec_type_system | |
945 | { | |
946 | ||
947 | // TODO: test it with clang++ from git | |
948 | ||
949 | struct Good {}; | |
950 | struct Bad {}; | |
951 | ||
952 | void g1() noexcept; | |
953 | void g2(); | |
954 | ||
955 | template<typename T> | |
956 | Bad | |
957 | f(T*, T*); | |
958 | ||
959 | template<typename T1, typename T2> | |
960 | Good | |
961 | f(T1*, T2*); | |
962 | ||
963 | static_assert (std::is_same_v<Good, decltype(f(g1, g2))>); | |
964 | ||
965 | } | |
966 | #endif // !defined(REALLY_CLANG) | |
967 | ||
968 | namespace test_inline_variables | |
969 | { | |
970 | ||
971 | template<class T> void f(T) | |
972 | {} | |
973 | ||
974 | template<class T> inline T g(T) | |
975 | { | |
976 | return T{}; | |
977 | } | |
978 | ||
979 | template<> inline void f<>(int) | |
980 | {} | |
981 | ||
982 | template<> int g<>(int) | |
983 | { | |
984 | return 5; | |
985 | } | |
986 | ||
987 | } | |
988 | ||
989 | } // namespace cxx17 | |
990 | ||
991 | #endif // __cplusplus <= 201402L | |
992 | ||
993 | ]]) |