Index: third_party/protobuf/m4/ax_cxx_compile_stdcxx.m4 |
diff --git a/third_party/protobuf/m4/ax_cxx_compile_stdcxx.m4 b/third_party/protobuf/m4/ax_cxx_compile_stdcxx.m4 |
new file mode 100644 |
index 0000000000000000000000000000000000000000..b61fcb6314a3b569c94de08f64cd705447defdde |
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+++ b/third_party/protobuf/m4/ax_cxx_compile_stdcxx.m4 |
@@ -0,0 +1,982 @@ |
+# =========================================================================== |
+# http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html |
+# =========================================================================== |
+# |
+# SYNOPSIS |
+# |
+# AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional]) |
+# |
+# DESCRIPTION |
+# |
+# Check for baseline language coverage in the compiler for the specified |
+# version of the C++ standard. If necessary, add switches to CXX and |
+# CXXCPP to enable support. VERSION may be '11' (for the C++11 standard) |
+# or '14' (for the C++14 standard). |
+# |
+# The second argument, if specified, indicates whether you insist on an |
+# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g. |
+# -std=c++11). If neither is specified, you get whatever works, with |
+# preference for an extended mode. |
+# |
+# The third argument, if specified 'mandatory' or if left unspecified, |
+# indicates that baseline support for the specified C++ standard is |
+# required and that the macro should error out if no mode with that |
+# support is found. If specified 'optional', then configuration proceeds |
+# regardless, after defining HAVE_CXX${VERSION} if and only if a |
+# supporting mode is found. |
+# |
+# LICENSE |
+# |
+# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com> |
+# Copyright (c) 2012 Zack Weinberg <zackw@panix.com> |
+# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu> |
+# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com> |
+# Copyright (c) 2015 Paul Norman <penorman@mac.com> |
+# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu> |
+# Copyright (c) 2016 Krzesimir Nowak <qdlacz@gmail.com> |
+# |
+# Copying and distribution of this file, with or without modification, are |
+# permitted in any medium without royalty provided the copyright notice |
+# and this notice are preserved. This file is offered as-is, without any |
+# warranty. |
+ |
+#serial 6 |
+ |
+dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro |
+dnl (serial version number 13). |
+ |
+AX_REQUIRE_DEFINED([AC_MSG_WARN]) |
+AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl |
+ m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"], |
+ [$1], [14], [ax_cxx_compile_alternatives="14 1y"], |
+ [$1], [17], [ax_cxx_compile_alternatives="17 1z"], |
+ [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl |
+ m4_if([$2], [], [], |
+ [$2], [ext], [], |
+ [$2], [noext], [], |
+ [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl |
+ m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true], |
+ [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true], |
+ [$3], [optional], [ax_cxx_compile_cxx$1_required=false], |
+ [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])]) |
+ AC_LANG_PUSH([C++])dnl |
+ ac_success=no |
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features by default, |
+ ax_cv_cxx_compile_cxx$1, |
+ [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], |
+ [ax_cv_cxx_compile_cxx$1=yes], |
+ [ax_cv_cxx_compile_cxx$1=no])]) |
+ if test x$ax_cv_cxx_compile_cxx$1 = xyes; then |
+ ac_success=yes |
+ fi |
+ |
+ m4_if([$2], [noext], [], [dnl |
+ if test x$ac_success = xno; then |
+ for alternative in ${ax_cxx_compile_alternatives}; do |
+ switch="-std=gnu++${alternative}" |
+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) |
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, |
+ $cachevar, |
+ [ac_save_CXX="$CXX" |
+ CXX="$CXX $switch" |
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], |
+ [eval $cachevar=yes], |
+ [eval $cachevar=no]) |
+ CXX="$ac_save_CXX"]) |
+ if eval test x\$$cachevar = xyes; then |
+ CXX="$CXX $switch" |
+ if test -n "$CXXCPP" ; then |
+ CXXCPP="$CXXCPP $switch" |
+ fi |
+ ac_success=yes |
+ break |
+ fi |
+ done |
+ fi]) |
+ |
+ m4_if([$2], [ext], [], [dnl |
+ if test x$ac_success = xno; then |
+ dnl HP's aCC needs +std=c++11 according to: |
+ dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf |
+ dnl Cray's crayCC needs "-h std=c++11" |
+ for alternative in ${ax_cxx_compile_alternatives}; do |
+ for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do |
+ cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch]) |
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch, |
+ $cachevar, |
+ [ac_save_CXX="$CXX" |
+ CXX="$CXX $switch" |
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])], |
+ [eval $cachevar=yes], |
+ [eval $cachevar=no]) |
+ CXX="$ac_save_CXX"]) |
+ if eval test x\$$cachevar = xyes; then |
+ CXX="$CXX $switch" |
+ if test -n "$CXXCPP" ; then |
+ CXXCPP="$CXXCPP $switch" |
+ fi |
+ ac_success=yes |
+ break |
+ fi |
+ done |
+ if test x$ac_success = xyes; then |
+ break |
+ fi |
+ done |
+ fi]) |
+ AC_LANG_POP([C++]) |
+ if test x$ax_cxx_compile_cxx$1_required = xtrue; then |
+ if test x$ac_success = xno; then |
+ AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.]) |
+ fi |
+ fi |
+ if test x$ac_success = xno; then |
+ HAVE_CXX$1=0 |
+ AC_MSG_NOTICE([No compiler with C++$1 support was found]) |
+ else |
+ HAVE_CXX$1=1 |
+ AC_DEFINE(HAVE_CXX$1,1, |
+ [define if the compiler supports basic C++$1 syntax]) |
+ fi |
+ AC_SUBST(HAVE_CXX$1) |
+ m4_if([$1], [17], [AC_MSG_WARN([C++17 is not yet standardized, so the checks may change in incompatible ways anytime])]) |
+]) |
+ |
+ |
+dnl Test body for checking C++11 support |
+ |
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11], |
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 |
+) |
+ |
+ |
+dnl Test body for checking C++14 support |
+ |
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14], |
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 |
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 |
+) |
+ |
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17], |
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_11 |
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_14 |
+ _AX_CXX_COMPILE_STDCXX_testbody_new_in_17 |
+) |
+ |
+dnl Tests for new features in C++11 |
+ |
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[ |
+ |
+// If the compiler admits that it is not ready for C++11, why torture it? |
+// Hopefully, this will speed up the test. |
+ |
+#ifndef __cplusplus |
+ |
+#error "This is not a C++ compiler" |
+ |
+#elif __cplusplus < 201103L |
+ |
+#error "This is not a C++11 compiler" |
+ |
+#else |
+ |
+namespace cxx11 |
+{ |
+ |
+ namespace test_static_assert |
+ { |
+ |
+ template <typename T> |
+ struct check |
+ { |
+ static_assert(sizeof(int) <= sizeof(T), "not big enough"); |
+ }; |
+ |
+ } |
+ |
+ namespace test_final_override |
+ { |
+ |
+ struct Base |
+ { |
+ virtual void f() {} |
+ }; |
+ |
+ struct Derived : public Base |
+ { |
+ virtual void f() override {} |
+ }; |
+ |
+ } |
+ |
+ namespace test_double_right_angle_brackets |
+ { |
+ |
+ template < typename T > |
+ struct check {}; |
+ |
+ typedef check<void> single_type; |
+ typedef check<check<void>> double_type; |
+ typedef check<check<check<void>>> triple_type; |
+ typedef check<check<check<check<void>>>> quadruple_type; |
+ |
+ } |
+ |
+ namespace test_decltype |
+ { |
+ |
+ int |
+ f() |
+ { |
+ int a = 1; |
+ decltype(a) b = 2; |
+ return a + b; |
+ } |
+ |
+ } |
+ |
+ namespace test_type_deduction |
+ { |
+ |
+ template < typename T1, typename T2 > |
+ struct is_same |
+ { |
+ static const bool value = false; |
+ }; |
+ |
+ template < typename T > |
+ struct is_same<T, T> |
+ { |
+ static const bool value = true; |
+ }; |
+ |
+ template < typename T1, typename T2 > |
+ auto |
+ add(T1 a1, T2 a2) -> decltype(a1 + a2) |
+ { |
+ return a1 + a2; |
+ } |
+ |
+ int |
+ test(const int c, volatile int v) |
+ { |
+ static_assert(is_same<int, decltype(0)>::value == true, ""); |
+ static_assert(is_same<int, decltype(c)>::value == false, ""); |
+ static_assert(is_same<int, decltype(v)>::value == false, ""); |
+ auto ac = c; |
+ auto av = v; |
+ auto sumi = ac + av + 'x'; |
+ auto sumf = ac + av + 1.0; |
+ static_assert(is_same<int, decltype(ac)>::value == true, ""); |
+ static_assert(is_same<int, decltype(av)>::value == true, ""); |
+ static_assert(is_same<int, decltype(sumi)>::value == true, ""); |
+ static_assert(is_same<int, decltype(sumf)>::value == false, ""); |
+ static_assert(is_same<int, decltype(add(c, v))>::value == true, ""); |
+ return (sumf > 0.0) ? sumi : add(c, v); |
+ } |
+ |
+ } |
+ |
+ namespace test_noexcept |
+ { |
+ |
+ int f() { return 0; } |
+ int g() noexcept { return 0; } |
+ |
+ static_assert(noexcept(f()) == false, ""); |
+ static_assert(noexcept(g()) == true, ""); |
+ |
+ } |
+ |
+ namespace test_constexpr |
+ { |
+ |
+ template < typename CharT > |
+ unsigned long constexpr |
+ strlen_c_r(const CharT *const s, const unsigned long acc) noexcept |
+ { |
+ return *s ? strlen_c_r(s + 1, acc + 1) : acc; |
+ } |
+ |
+ template < typename CharT > |
+ unsigned long constexpr |
+ strlen_c(const CharT *const s) noexcept |
+ { |
+ return strlen_c_r(s, 0UL); |
+ } |
+ |
+ static_assert(strlen_c("") == 0UL, ""); |
+ static_assert(strlen_c("1") == 1UL, ""); |
+ static_assert(strlen_c("example") == 7UL, ""); |
+ static_assert(strlen_c("another\0example") == 7UL, ""); |
+ |
+ } |
+ |
+ namespace test_rvalue_references |
+ { |
+ |
+ template < int N > |
+ struct answer |
+ { |
+ static constexpr int value = N; |
+ }; |
+ |
+ answer<1> f(int&) { return answer<1>(); } |
+ answer<2> f(const int&) { return answer<2>(); } |
+ answer<3> f(int&&) { return answer<3>(); } |
+ |
+ void |
+ test() |
+ { |
+ int i = 0; |
+ const int c = 0; |
+ static_assert(decltype(f(i))::value == 1, ""); |
+ static_assert(decltype(f(c))::value == 2, ""); |
+ static_assert(decltype(f(0))::value == 3, ""); |
+ } |
+ |
+ } |
+ |
+ namespace test_uniform_initialization |
+ { |
+ |
+ struct test |
+ { |
+ static const int zero {}; |
+ static const int one {1}; |
+ }; |
+ |
+ static_assert(test::zero == 0, ""); |
+ static_assert(test::one == 1, ""); |
+ |
+ } |
+ |
+ namespace test_lambdas |
+ { |
+ |
+ void |
+ test1() |
+ { |
+ auto lambda1 = [](){}; |
+ auto lambda2 = lambda1; |
+ lambda1(); |
+ lambda2(); |
+ } |
+ |
+ int |
+ test2() |
+ { |
+ auto a = [](int i, int j){ return i + j; }(1, 2); |
+ auto b = []() -> int { return '0'; }(); |
+ auto c = [=](){ return a + b; }(); |
+ auto d = [&](){ return c; }(); |
+ auto e = [a, &b](int x) mutable { |
+ const auto identity = [](int y){ return y; }; |
+ for (auto i = 0; i < a; ++i) |
+ a += b--; |
+ return x + identity(a + b); |
+ }(0); |
+ return a + b + c + d + e; |
+ } |
+ |
+ int |
+ test3() |
+ { |
+ const auto nullary = [](){ return 0; }; |
+ const auto unary = [](int x){ return x; }; |
+ using nullary_t = decltype(nullary); |
+ using unary_t = decltype(unary); |
+ const auto higher1st = [](nullary_t f){ return f(); }; |
+ const auto higher2nd = [unary](nullary_t f1){ |
+ return [unary, f1](unary_t f2){ return f2(unary(f1())); }; |
+ }; |
+ return higher1st(nullary) + higher2nd(nullary)(unary); |
+ } |
+ |
+ } |
+ |
+ namespace test_variadic_templates |
+ { |
+ |
+ template <int...> |
+ struct sum; |
+ |
+ template <int N0, int... N1toN> |
+ struct sum<N0, N1toN...> |
+ { |
+ static constexpr auto value = N0 + sum<N1toN...>::value; |
+ }; |
+ |
+ template <> |
+ struct sum<> |
+ { |
+ static constexpr auto value = 0; |
+ }; |
+ |
+ static_assert(sum<>::value == 0, ""); |
+ static_assert(sum<1>::value == 1, ""); |
+ static_assert(sum<23>::value == 23, ""); |
+ static_assert(sum<1, 2>::value == 3, ""); |
+ static_assert(sum<5, 5, 11>::value == 21, ""); |
+ static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, ""); |
+ |
+ } |
+ |
+ // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae |
+ // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function |
+ // because of this. |
+ namespace test_template_alias_sfinae |
+ { |
+ |
+ struct foo {}; |
+ |
+ template<typename T> |
+ using member = typename T::member_type; |
+ |
+ template<typename T> |
+ void func(...) {} |
+ |
+ template<typename T> |
+ void func(member<T>*) {} |
+ |
+ void test(); |
+ |
+ void test() { func<foo>(0); } |
+ |
+ } |
+ |
+} // namespace cxx11 |
+ |
+#endif // __cplusplus >= 201103L |
+ |
+]]) |
+ |
+ |
+dnl Tests for new features in C++14 |
+ |
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[ |
+ |
+// If the compiler admits that it is not ready for C++14, why torture it? |
+// Hopefully, this will speed up the test. |
+ |
+#ifndef __cplusplus |
+ |
+#error "This is not a C++ compiler" |
+ |
+#elif __cplusplus < 201402L |
+ |
+#error "This is not a C++14 compiler" |
+ |
+#else |
+ |
+namespace cxx14 |
+{ |
+ |
+ namespace test_polymorphic_lambdas |
+ { |
+ |
+ int |
+ test() |
+ { |
+ const auto lambda = [](auto&&... args){ |
+ const auto istiny = [](auto x){ |
+ return (sizeof(x) == 1UL) ? 1 : 0; |
+ }; |
+ const int aretiny[] = { istiny(args)... }; |
+ return aretiny[0]; |
+ }; |
+ return lambda(1, 1L, 1.0f, '1'); |
+ } |
+ |
+ } |
+ |
+ namespace test_binary_literals |
+ { |
+ |
+ constexpr auto ivii = 0b0000000000101010; |
+ static_assert(ivii == 42, "wrong value"); |
+ |
+ } |
+ |
+ namespace test_generalized_constexpr |
+ { |
+ |
+ template < typename CharT > |
+ constexpr unsigned long |
+ strlen_c(const CharT *const s) noexcept |
+ { |
+ auto length = 0UL; |
+ for (auto p = s; *p; ++p) |
+ ++length; |
+ return length; |
+ } |
+ |
+ static_assert(strlen_c("") == 0UL, ""); |
+ static_assert(strlen_c("x") == 1UL, ""); |
+ static_assert(strlen_c("test") == 4UL, ""); |
+ static_assert(strlen_c("another\0test") == 7UL, ""); |
+ |
+ } |
+ |
+ namespace test_lambda_init_capture |
+ { |
+ |
+ int |
+ test() |
+ { |
+ auto x = 0; |
+ const auto lambda1 = [a = x](int b){ return a + b; }; |
+ const auto lambda2 = [a = lambda1(x)](){ return a; }; |
+ return lambda2(); |
+ } |
+ |
+ } |
+ |
+ namespace test_digit_separators |
+ { |
+ |
+ constexpr auto ten_million = 100'000'000; |
+ static_assert(ten_million == 100000000, ""); |
+ |
+ } |
+ |
+ namespace test_return_type_deduction |
+ { |
+ |
+ auto f(int& x) { return x; } |
+ decltype(auto) g(int& x) { return x; } |
+ |
+ template < typename T1, typename T2 > |
+ struct is_same |
+ { |
+ static constexpr auto value = false; |
+ }; |
+ |
+ template < typename T > |
+ struct is_same<T, T> |
+ { |
+ static constexpr auto value = true; |
+ }; |
+ |
+ int |
+ test() |
+ { |
+ auto x = 0; |
+ static_assert(is_same<int, decltype(f(x))>::value, ""); |
+ static_assert(is_same<int&, decltype(g(x))>::value, ""); |
+ return x; |
+ } |
+ |
+ } |
+ |
+} // namespace cxx14 |
+ |
+#endif // __cplusplus >= 201402L |
+ |
+]]) |
+ |
+ |
+dnl Tests for new features in C++17 |
+ |
+m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[ |
+ |
+// If the compiler admits that it is not ready for C++17, why torture it? |
+// Hopefully, this will speed up the test. |
+ |
+#ifndef __cplusplus |
+ |
+#error "This is not a C++ compiler" |
+ |
+#elif __cplusplus <= 201402L |
+ |
+#error "This is not a C++17 compiler" |
+ |
+#else |
+ |
+#if defined(__clang__) |
+ #define REALLY_CLANG |
+#else |
+ #if defined(__GNUC__) |
+ #define REALLY_GCC |
+ #endif |
+#endif |
+ |
+#include <initializer_list> |
+#include <utility> |
+#include <type_traits> |
+ |
+namespace cxx17 |
+{ |
+ |
+#if !defined(REALLY_CLANG) |
+ namespace test_constexpr_lambdas |
+ { |
+ |
+ // TODO: test it with clang++ from git |
+ |
+ constexpr int foo = [](){return 42;}(); |
+ |
+ } |
+#endif // !defined(REALLY_CLANG) |
+ |
+ namespace test::nested_namespace::definitions |
+ { |
+ |
+ } |
+ |
+ namespace test_fold_expression |
+ { |
+ |
+ template<typename... Args> |
+ int multiply(Args... args) |
+ { |
+ return (args * ... * 1); |
+ } |
+ |
+ template<typename... Args> |
+ bool all(Args... args) |
+ { |
+ return (args && ...); |
+ } |
+ |
+ } |
+ |
+ namespace test_extended_static_assert |
+ { |
+ |
+ static_assert (true); |
+ |
+ } |
+ |
+ namespace test_auto_brace_init_list |
+ { |
+ |
+ auto foo = {5}; |
+ auto bar {5}; |
+ |
+ static_assert(std::is_same<std::initializer_list<int>, decltype(foo)>::value); |
+ static_assert(std::is_same<int, decltype(bar)>::value); |
+ } |
+ |
+ namespace test_typename_in_template_template_parameter |
+ { |
+ |
+ template<template<typename> typename X> struct D; |
+ |
+ } |
+ |
+ namespace test_fallthrough_nodiscard_maybe_unused_attributes |
+ { |
+ |
+ int f1() |
+ { |
+ return 42; |
+ } |
+ |
+ [[nodiscard]] int f2() |
+ { |
+ [[maybe_unused]] auto unused = f1(); |
+ |
+ switch (f1()) |
+ { |
+ case 17: |
+ f1(); |
+ [[fallthrough]]; |
+ case 42: |
+ f1(); |
+ } |
+ return f1(); |
+ } |
+ |
+ } |
+ |
+ namespace test_extended_aggregate_initialization |
+ { |
+ |
+ struct base1 |
+ { |
+ int b1, b2 = 42; |
+ }; |
+ |
+ struct base2 |
+ { |
+ base2() { |
+ b3 = 42; |
+ } |
+ int b3; |
+ }; |
+ |
+ struct derived : base1, base2 |
+ { |
+ int d; |
+ }; |
+ |
+ derived d1 {{1, 2}, {}, 4}; // full initialization |
+ derived d2 {{}, {}, 4}; // value-initialized bases |
+ |
+ } |
+ |
+ namespace test_general_range_based_for_loop |
+ { |
+ |
+ struct iter |
+ { |
+ int i; |
+ |
+ int& operator* () |
+ { |
+ return i; |
+ } |
+ |
+ const int& operator* () const |
+ { |
+ return i; |
+ } |
+ |
+ iter& operator++() |
+ { |
+ ++i; |
+ return *this; |
+ } |
+ }; |
+ |
+ struct sentinel |
+ { |
+ int i; |
+ }; |
+ |
+ bool operator== (const iter& i, const sentinel& s) |
+ { |
+ return i.i == s.i; |
+ } |
+ |
+ bool operator!= (const iter& i, const sentinel& s) |
+ { |
+ return !(i == s); |
+ } |
+ |
+ struct range |
+ { |
+ iter begin() const |
+ { |
+ return {0}; |
+ } |
+ |
+ sentinel end() const |
+ { |
+ return {5}; |
+ } |
+ }; |
+ |
+ void f() |
+ { |
+ range r {}; |
+ |
+ for (auto i : r) |
+ { |
+ [[maybe_unused]] auto v = i; |
+ } |
+ } |
+ |
+ } |
+ |
+ namespace test_lambda_capture_asterisk_this_by_value |
+ { |
+ |
+ struct t |
+ { |
+ int i; |
+ int foo() |
+ { |
+ return [*this]() |
+ { |
+ return i; |
+ }(); |
+ } |
+ }; |
+ |
+ } |
+ |
+ namespace test_enum_class_construction |
+ { |
+ |
+ enum class byte : unsigned char |
+ {}; |
+ |
+ byte foo {42}; |
+ |
+ } |
+ |
+ namespace test_constexpr_if |
+ { |
+ |
+ template <bool cond> |
+ int f () |
+ { |
+ if constexpr(cond) |
+ { |
+ return 13; |
+ } |
+ else |
+ { |
+ return 42; |
+ } |
+ } |
+ |
+ } |
+ |
+ namespace test_selection_statement_with_initializer |
+ { |
+ |
+ int f() |
+ { |
+ return 13; |
+ } |
+ |
+ int f2() |
+ { |
+ if (auto i = f(); i > 0) |
+ { |
+ return 3; |
+ } |
+ |
+ switch (auto i = f(); i + 4) |
+ { |
+ case 17: |
+ return 2; |
+ |
+ default: |
+ return 1; |
+ } |
+ } |
+ |
+ } |
+ |
+#if !defined(REALLY_CLANG) |
+ namespace test_template_argument_deduction_for_class_templates |
+ { |
+ |
+ // TODO: test it with clang++ from git |
+ |
+ template <typename T1, typename T2> |
+ struct pair |
+ { |
+ pair (T1 p1, T2 p2) |
+ : m1 {p1}, |
+ m2 {p2} |
+ {} |
+ |
+ T1 m1; |
+ T2 m2; |
+ }; |
+ |
+ void f() |
+ { |
+ [[maybe_unused]] auto p = pair{13, 42u}; |
+ } |
+ |
+ } |
+#endif // !defined(REALLY_CLANG) |
+ |
+ namespace test_non_type_auto_template_parameters |
+ { |
+ |
+ template <auto n> |
+ struct B |
+ {}; |
+ |
+ B<5> b1; |
+ B<'a'> b2; |
+ |
+ } |
+ |
+#if !defined(REALLY_CLANG) |
+ namespace test_structured_bindings |
+ { |
+ |
+ // TODO: test it with clang++ from git |
+ |
+ int arr[2] = { 1, 2 }; |
+ std::pair<int, int> pr = { 1, 2 }; |
+ |
+ auto f1() -> int(&)[2] |
+ { |
+ return arr; |
+ } |
+ |
+ auto f2() -> std::pair<int, int>& |
+ { |
+ return pr; |
+ } |
+ |
+ struct S |
+ { |
+ int x1 : 2; |
+ volatile double y1; |
+ }; |
+ |
+ S f3() |
+ { |
+ return {}; |
+ } |
+ |
+ auto [ x1, y1 ] = f1(); |
+ auto& [ xr1, yr1 ] = f1(); |
+ auto [ x2, y2 ] = f2(); |
+ auto& [ xr2, yr2 ] = f2(); |
+ const auto [ x3, y3 ] = f3(); |
+ |
+ } |
+#endif // !defined(REALLY_CLANG) |
+ |
+#if !defined(REALLY_CLANG) |
+ namespace test_exception_spec_type_system |
+ { |
+ |
+ // TODO: test it with clang++ from git |
+ |
+ struct Good {}; |
+ struct Bad {}; |
+ |
+ void g1() noexcept; |
+ void g2(); |
+ |
+ template<typename T> |
+ Bad |
+ f(T*, T*); |
+ |
+ template<typename T1, typename T2> |
+ Good |
+ f(T1*, T2*); |
+ |
+ static_assert (std::is_same_v<Good, decltype(f(g1, g2))>); |
+ |
+ } |
+#endif // !defined(REALLY_CLANG) |
+ |
+ namespace test_inline_variables |
+ { |
+ |
+ template<class T> void f(T) |
+ {} |
+ |
+ template<class T> inline T g(T) |
+ { |
+ return T{}; |
+ } |
+ |
+ template<> inline void f<>(int) |
+ {} |
+ |
+ template<> int g<>(int) |
+ { |
+ return 5; |
+ } |
+ |
+ } |
+ |
+} // namespace cxx17 |
+ |
+#endif // __cplusplus <= 201402L |
+ |
+]]) |