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