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Provide macros to identify native standard library features. More...
Variables | |
| const char * | bsls_libraryfeatures_CPP17_ABI |
BSLS_LIBRARYFEATURES_HAS_C90_GETS BSLS_LIBRARYFEATURES_HAS_C99_FP_CLASSIFY BSLS_LIBRARYFEATURES_HAS_C99_LIBRARY BSLS_LIBRARYFEATURES_HAS_C99_SNPRINTF BSLS_LIBRARYFEATURES_HAS_CPP98_AUTO_PTR BSLS_LIBRARYFEATURES_HAS_CPP98_BINDERS_API BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY BSLS_LIBRARYFEATURES_HAS_CPP14_BASELINE_LIBRARY BSLS_LIBRARYFEATURES_HAS_CPP14_INTEGER_SEQUENCE BSLS_LIBRARYFEATURES_HAS_CPP17_BASELINE_LIBRARY BSLS_LIBRARYFEATURES_HAS_CPP20_BASELINE_LIBRARY BSLS_LIBRARYFEATURES_HAS_CPP11_EXCEPTION_HANDLING BSLS_LIBRARYFEATURES_HAS_CPP11_GARBAGE_COLLECTION_API BSLS_LIBRARYFEATURES_HAS_CPP11_MISCELLANEOUS_UTILITIES BSLS_LIBRARYFEATURES_HAS_CPP11_PAIR_PIECEWISE_CONSTRUCTOR BSLS_LIBRARYFEATURES_HAS_CPP17_PRECISE_BITWIDTH_ATOMICS BSLS_LIBRARYFEATURES_HAS_CPP17_SEARCH_FUNCTORS BSLS_LIBRARYFEATURES_HAS_CPP17_SEARCH_OVERLOAD BSLS_LIBRARYFEATURES_HAS_CPP17_DEPRECATED_REMOVED BSLS_LIBRARYFEATURES_HAS_CPP20_DEPRECATED_REMOVED BSLS_LIBRARYFEATURES_HAS_CPP11_PROGRAM_TERMINATION BSLS_LIBRARYFEATURES_HAS_CPP11_RANGE_FUNCTIONS BSLS_LIBRARYFEATURES_HAS_CPP14_RANGE_FUNCTIONS BSLS_LIBRARYFEATURES_HAS_CPP11_STREAM_MOVE BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE BSLS_LIBRARYFEATURES_HAS_CPP11_UNIQUE_PTR BSLS_LIBRARYFEATURES_HAS_CPP17_BOOL_CONSTANT: NOT DEFINED BSLS_LIBRARYFEATURES_HAS_CPP17_RANGE_FUNCTIONS BSLS_LIBRARYFEATURES_HAS_CPP17_ALIGNED_ALLOC BSLS_LIBRARYFEATURES_HAS_CPP17_TIMESPEC_GET BSLS_LIBRARYFEATURES_HAS_CPP17_SPECIAL_MATH_FUNCTIONS BSLS_LIBRARYFEATURES_HAS_CPP17_INT_CHARCONV BSLS_LIBRARYFEATURES_HAS_CPP17_CHARCONV BSLS_LIBRARYFEATURES_HAS_CPP17_FILESYSTEM BSLS_LIBRARYFEATURES_HAS_CPP20_VERSION BSLS_LIBRARYFEATURES_HAS_CPP20_BARRIER BSLS_LIBRARYFEATURES_HAS_CPP20_LATCH BSLS_LIBRARYFEATURES_HAS_CPP20_RANGES BSLS_LIBRARYFEATURES_HAS_CPP20_SEMAPHORE BSLS_LIBRARYFEATURES_HAS_CPP20_STOP_TOKEN BSLS_LIBRARYFEATURES_STDCPP_GNU BSLS_LIBRARYFEATURES_STDCPP_IBM BSLS_LIBRARYFEATURES_STDCPP_INTELLISENSE BSLS_LIBRARYFEATURES_STDCPP_LLVM BSLS_LIBRARYFEATURES_STDCPP_MSVC BSLS_LIBRARYFEATURES_STDCPP_LIBCSTD BSLS_LIBRARYFEATURES_STDCPP_STLPORT | BSLS_LIBRARYFEATURES_HAS_C90_GETS | C90 gets provided |
| BSLS_LIBRARYFEATURES_HAS_C99_FP_CLASSIFY | fpclassify et al. provided in std |
| BSLS_LIBRARYFEATURES_HAS_C99_LIBRARY | C99 library provided |
| BSLS_LIBRARYFEATURES_HAS_C99_SNPRINTF | C99 snprintf provided |
| BSLS_LIBRARYFEATURES_HAS_CPP98_AUTO_PTR | auto_ptr provided |
| BSLS_LIBRARYFEATURES_HAS_CPP98_BINDERS_API | adaptable function API provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY | C++11 base lib provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_EXCEPTION_HANDLING | except handling provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_GARBAGE_COLLECTION_API | GC support provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_MISCELLANEOUS_UTILITIES | misc utils provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_PAIR_PIECEWISE_CONSTRUCTOR | use "piecewise" |
| BSLS_LIBRARYFEATURES_HAS_CPP11_PROGRAM_TERMINATION | "program exit" provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_RANGE_FUNCTIONS | begin and end provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_STREAM_MOVE | basic_stream move operations |
| BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE | tuple provided |
| BSLS_LIBRARYFEATURES_HAS_CPP11_UNIQUE_PTR | unique_ptr provided |
| BSLS_LIBRARYFEATURES_HAS_CPP14_BASELINE_LIBRARY | C++14 base lib provided |
| BSLS_LIBRARYFEATURES_HAS_CPP14_INTEGER_SEQUENCE | integer_sequence defined |
| BSLS_LIBRARYFEATURES_HAS_CPP14_RANGE_FUNCTIONS | range functions extension |
| BSLS_LIBRARYFEATURES_HAS_CPP17_BASELINE_LIBRARY | C++17 base lib provided |
| BSLS_LIBRARYFEATURES_HAS_CPP17_BOOL_CONSTANT | NOT DEFINED see below |
| BSLS_LIBRARYFEATURES_HAS_CPP17_EXCEPTION_HANDLING | except handling provided |
| BSLS_LIBRARYFEATURES_HAS_CPP17_PRECISE_BITWIDTH_ATOMICS | optional atomics |
| BSLS_LIBRARYFEATURES_HAS_CPP17_SEARCH_FUNCTORS | searcher function objects |
| BSLS_LIBRARYFEATURES_HAS_CPP17_SEARCH_OVERLOAD | searcher object overload |
| BSLS_LIBRARYFEATURES_HAS_CPP17_DEPRECATED_REMOVED | ptr_fun et al. gone |
| BSLS_LIBRARYFEATURES_HAS_CPP17_INT_CHARCONV | <charconv> for integers only |
| BSLS_LIBRARYFEATURES_HAS_CPP17_CHARCONV | full <charconv> support |
| BSLS_LIBRARYFEATURES_HAS_CPP17_FILESYSTEM | <filesystem> |
| BSLS_LIBRARYFEATURES_HAS_CPP17_PARALLEL_ALGORITHMS | <execution> |
| BSLS_LIBRARYFEATURES_HAS_CPP17_PMR | <memory_resource> |
| BSLS_LIBRARYFEATURES_HAS_CPP17_TIMESPEC_GET | <ctime> |
| BSLS_LIBRARYFEATURES_HAS_CPP17_ALIGNED_ALLOC | <cstdlib> |
| BSLS_LIBRARYFEATURES_HAS_CPP20_BASELINE_LIBRARY | C++20 base lib provided |
| BSLS_LIBRARYFEATURES_HAS_CPP20_DEPRECATED_REMOVED | result_of et al. gone |
| BSLS_LIBRARYFEATURES_HAS_CPP20_VERSION | <version> |
| BSLS_LIBRARYFEATURES_HAS_CPP20_BARRIER | <barrier> |
| BSLS_LIBRARYFEATURES_HAS_CPP20_LATCH | <latch> |
| BSLS_LIBRARYFEATURES_HAS_CPP20_RANGES | <ranges> |
| BSLS_LIBRARYFEATURES_HAS_CPP20_SEMAPHORE | <semaphore> |
| BSLS_LIBRARYFEATURES_HAS_CPP20_STOP_TOKEN | <stop_token> |
| BSLS_LIBRARYFEATURES_STDCPP_GNU | implementation is GNU libstdc++ |
| BSLS_LIBRARYFEATURES_STDCPP_IBM | implementation is IBM |
| BSLS_LIBRARYFEATURES_STDCPP_INTELLISENSE | Intellisense is running |
| BSLS_LIBRARYFEATURES_STDCPP_LLVM | implementation is LLVM libc++ |
| BSLS_LIBRARYFEATURES_STDCPP_MSVC | implementation is MSVC |
| BSLS_LIBRARYFEATURES_STDCPP_LIBCSTD | implementation is Sun's (RogueWave) |
| BSLS_LIBRARYFEATURES_STDCPP_STLPORT | implementation is STLPort |
BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY can be used to conditionally compile BDE code depending on those functions when they are available, and exclude that code when those functions are not present, thereby allowing compilation by earlier tool-chains. std namespace. BSLS_LIBRARYFEATURES_HAS_C90_GETS macro is defined if the gets function (defined in <cstdio>) is provided in namespace std by the native standard library. This dangerous function is removed from the C++14 standard library, and its use with earlier dialects is strongly discouraged. BSLS_LIBRARYFEATURES_HAS_C99_FP_CLASSIFY macro is defined if all of the listed floating-point classification functions, defined in the headers named below, are implemented by the native standard library in namespace std: Functions defined in <cmath>
fpclassify isfinite isinf isnan isnormal signbit isgreater isgreaterequal isless islessequal islessgreater isunordered BSLS_LIBRARYFEATURES_HAS_C99_LIBRARY macro is defined if all of the listed functions and types, defined in the headers named below, are implemented by the native standard library in namespace std: Functions defined in <cctype>
isblank Functions defined in <cmath>
double_t float_t acosh asinh atanh cbrt copysign erf erfc exp2 expm1 fdim fma fmax fmin hypot ilogb lgamma llrint log1p log2 logb lrint lround llround nan nanl nanf nearbyint nextafter nexttoward remainder remquo rint round scalbln scalbn tgamma trunc Functions defined in <cstdlib>
atoll llabs lldiv lldiv_t strtof strtold strtoll strtoull Functions defined in <cstdio>
vfscanf vsscanf vsnprintf vsscanf Functions defined in <cwchar>
vfwscanf vswscanf vwscanf wcstof wcstold wcstoll wcstoull Functions defined in <cwctype>
iswblank snprintf as that is included in the separate BSLS_LIBRARYFEATURES_HAS_C99_SNPRINTF macro. Also note that AIX and Solaris compilers generally have implementations of these functions in the global namespace when including the corresponding C header, but do not provide the standard C++ mapping. BSLS_LIBRARYFEATURES_HAS_C99_SNPRINTF macro is defined if snprintf function (defined in <cstdio>) is implemented by the native standard library in namespace std. Function defined in <cstdio>
snprintf BSLS_LIBRARYFEATURES_HAS_CPP98_AUTO_PTR macro is defined if the auto_ptr class template (defined in <memory>) is provided by the native standard library. This macro is expected to be defined for all libraries/platforms at least until the introduction of C++17 to our build systems. BSLS_LIBRARYFEATURES_HAS_CPP98_BINDERS_API macro is defined if the result_type, argument_type, first_argument_type and second_argument_type typedefs (defined in <functional>) are provided by the native standard library. This macro is expected to be defined for all libraries/platforms at least until the introduction of C++20 to our build systems. BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is used to identify whether the current platform's standard library supports a baseline set of C++11 library features (which are defined below). This is especially important in BSL when importing standard library functions and types into the bsl:: namespace, as is done in bsl+bslhdrs. In particular this macro is used where C++11 has introduced new functions and types into headers available in older versions of the C++ standard. For example, C++11 introduced the type move_iterator to the existing <iterator> header, so bsl_iterator.h uses this macro to determine whether to import std::move_iterator into the bsl namespace. The following functions and types are provided by the native standard library:
Functions defined in <algorithm>
all_of any_of copy_if copy_n find_if_not is_heap is_heap_until is_partitioned is_permutation is_sorted is_sorted_until minmax minmax_element move move_backward none_of partition_copy partition_point shuffle Types defined in <atomic>
Functions defined in <complex>
acosh asinh atanh proj Functions and types defined in <exception>
current_exception exception_ptr rethrow_exception Functions and types defined in <functional>
bind bit_and bit_or bit_xor cref is_bind_expression is_placeholder mem_fn ref reference_wrapper Functions defined in <iomanip>
get_money put_money Functions and types defined in <ios>
io_errc iostream_category is_error_code_enum make_error_code make_error_condition hexfloat defaultfloat Functions defined in <iterator>
begin end move_iterator make_move_iterator next prev Function defined in <locale>
isblank Functions defined in <memory>
addressof pointer_traits uninitialized_copy_n Function defined in <numeric>
iota Member function defined in <typeinfo>
type_info::hash_code Functions defined in <utility>
declval forward move move_if_noexcept swap random_shuffle as that is deprecated in C++14 and will be removed in C++17. BSLS_LIBRARYFEATURES_HAS_CPP14_BASELINE_LIBRARY macro is used to identify whether the current platform's standard library supports a baseline set of C++14 library features (which are defined below). This is especially important in BSL when importing standard library functions and types into the bsl:: namespace, as is done in bsl+bslhdrs. The following functions and types are provided by the native standard library:
<complex> Type defined in <functional>
Function defined in <iterator>
Function defined in <iomanip>
Function defined in <memory>
make_unique Function defined in <type_traits>
is_null_pointer is_final Function defined in <utility>
exchange BSLS_LIBRARYFEATURES_HAS_CPP14_INTEGER_SEQUENCE macro is defined if all of the listed conditions are true: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. BSLS_COMPILERFEATURES_SUPPORT_VARIADIC_TEMPLATES macro is also defined. BSLS_COMPILERFEATURES_SUPPORT_ALIAS_TEMPLATES macro is also defined. struct integer_sequence was introduced in the C++14 standard, bsl::integer_sequence is supported by BDE when compiling in C++11 mode. bsl:: namespace, as is done in bsl+bslhdrs. The following headers can be included:
bsl:: namespace, as is done in bsl+bslhdrs. The following headers can be included:
BSLS_LIBRARYFEATURES_HAS_CPP11_EXCEPTION_HANDLING macro is defined if both of the listed conditions are true: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. The following functions and types are provided by the native standard library in <exception>:
exception_ptr make_exception_ptr nested_exception rethrow_if_nested throw_with_nested BSLS_LIBRARYFEATURES_HAS_CPP11_GARBAGE_COLLECTION_API macro is defined if both of the listed conditions are true: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. The following functions and types are provided by the native standard library in <memory>:
declare_no_pointers declare_reachable get_pointer_safety pointer_safety undeclare_no_pointers undeclare_reachable BSLS_LIBRARYFEATURES_HAS_CPP11_MISCELLANEOUS_UTILITIES macro is defined if both of the listed conditions are true: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. The following functions and types are provided by the native standard library:
Type defined in <cstddef>
max_align_t Functions defined in <exception>
get_terminate get_unexpected Functions defined in <iomanip>
get_time put_time Functions defined in <locale>
isblank wstring_convert wbuffer_convert Function defined in <memory>
align Class and function defined in <new>
bad_array_new_length get_new_handler get_unexpected will be removed in C++17. BSLS_LIBRARYFEATURES_HAS_CPP11_PAIR_PIECEWISE_CONSTRUCTOR macro is defined if the pair class template (defined in <utility>) provided by the native library has a constructor with the signature: template <class... Args1, class... Args2> pair(piecewise_construct_t , tuple<Args1...> first_args, tuple<Args2...> second_args);
piecewise_construct_t (tag) type (defined in <utility>) is provided by the native standard library. BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. BSLS_COMPILERFEATURES_SUPPORT_VARIADIC_TEMPLATES macro is defined. BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE macro is defined. BSLS_LIBRARYFEATURES_HAS_CPP17_PRECISE_BITWIDTH_ATOMICS macro is defined if both of the listed conditions are true: defined if the <atomic> header provided by the native standard library provides type aliases for all of the following precise bit-width atomic types: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. The following type aliases are provided by the native standard library in the <atomic> header:
atomic_int8_t atomic_int16_t atomic_int32_t atomic_int64_t atomic_uint8_t atomic_uint16_t atomic_uint32_t atomic_uint64_t atomic_intptr_t atomic_uintptr_t BSLS_LIBRARYFEATURES_HAS_CPP17_SEARCH_FUNCTORS macro is defined if the native library supplies the following class templates in <functional>: default_searcher boyer_moore_searcher boyer_moore_horspool_searcher BSLS_LIBRARYFEATURES_HAS_CPP17_SEARCH_OVERLOAD macro is defined if <algorithm> defines an overload for the search function template that accepts instances of the searcher classes introduced in C++17. See [alg.search]: template<class ForwardIterator, class Searcher> constexpr ForwardIterator std::search(ForwardIterator first, ForwardIterator last, const Searcher& searcher);
BSLS_LIBRARYFEATURES_HAS_CPP17_DEPRECATED_REMOVED macro is defined for libraries that do not export names removed in C++17, such as std::ptr_fun. BSLS_LIBRARYFEATURES_HAS_CPP17_DEPRECATED_REMOVED is generally the negation of BSLS_LIBRARYFEATURES_HAS_CPP98_AUTO_PTR. Although the removal of deprecated C++17 types is conceptually equivalent to __cplusplus >= 201703L, standard library implementations often provide configuration flags to expose the deprecated library features. BSLS_LIBRARYFEATURES_HAS_CPP20_DEPRECATED_REMOVED macro is defined for libraries that do not export names removed in C++20, such as std::uncaught_exception. Although these names remain present in some standard library implementations (e.g., gcc), BSLS_LIBRARYFEATURES_HAS_CPP20_DEPRECATED_REMOVED is the equivalent of __cplusplus >= 202002L. BSLS_LIBRARYFEATURES_HAS_CPP11_PROGRAM_TERMINATION macro is defined if of the listed conditions are true: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. <cstdlib> header: _Exit quick_exit at_quick_exit BSLS_LIBRARYFEATURES_HAS_CPP11_RANGE_FUNCTIONS is defined if the following functions are provided by the native standard library in the <iterator> header: template <class C> auto begin(C& c) -> decltype(c.begin()); template <class C> auto begin(const C& c) -> decltype(c.begin()); template <class C> auto end(C& c) -> decltype(c.end()); template <class C> auto end(const C& c) -> decltype(c.end()); template <class T, size_t N> T* begin(T (&array)[N]); template <class T, size_t N> T* end(T (&array)[N]);
BSLS_LIBRARYFEATURES_HAS_CPP14_RANGE_FUNCTIONS macro is defined if the following functions are provided by the native standard library in the <iterator> header: template <class C> auto cbegin(const C& c) -> decltype(std::begin(c)); template <class C> auto cend(const C& c) -> decltype(std::end(c)); template <class C> auto rbegin(C& c) -> decltype(c.rbegin()); template <class C> auto rbegin(const C& c) -> decltype(c.rbegin()); template <class C> auto rend(C& c) -> decltype(c.rend()); template <class C> auto rend(const C& c) -> decltype(c.rend()); template <class T, size_t N> reverse_iterator<T*> rbegin(T (&array)[N]); template <class T, size_t N> reverse_iterator<T*> rend(T (&array)[N]); template <class E> reverse_iterator<const E*> rbegin( initializer_list<E> il); template <class E> reverse_iterator<const E*> rend(initializer_list<E> il); template <class C> auto crbegin(const C& c) -> decltype(std::rbegin(c)); template <class C> auto crend(const C& c) -> decltype(std::rend(c));
BSLS_LIBRARYFEATURES_HAS_CPP11_STREAM_MOVE is defined if the standard stream classes (basic_istream, basic_ostream, basic_stream) all have the C++11 mandated move operations (constructor and assignment operator) defined. Notice that the this macro is separate from the macro BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY as standard library implementations exist that implement almost all of C++11 (which is detected by the BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro) but not this feature. Note that when BSLS_LIBRARYFEATURES_HAS_CPP11_STREAM_MOVE is defined BSLS_COMPILERFEATURES_SUPPORT_RVALUE_REFERENCES will also be defined, as the standard feature cannot be implemented without rvalue reference support from the compiler. Supported by the compiler vendor's STL implementation
BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE macro is defined if both of the listed conditions are true: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. tuple type template (defined in <tuple>) is provided by the native standard library. BSLS_COMPILERFEATURES_SUPPORT_VARIADIC_TEMPLATES macro is also defined. BSLS_LIBRARYFEATURES_HAS_CPP11_UNIQUE_PTR macro is defined if both of the listed conditions are true: BSLS_LIBRARYFEATURES_HAS_CPP11_BASELINE_LIBRARY macro is defined. unique_ptr class template (defined in <memory>) is provided by the native standard library. BSLS_COMPILERFEATURES_SUPPORT_RVALUE_REFERENCES macro is also defined. BSLS_LIBRARYFEATURES_HAS_CPP17_BOOL_CONSTANT macro is never defined and is mentioned in this component as documentation until its appearance in several BDE test drivers is removed. BSLS_LIBRARYFEATURES_HAS_CPP17_BOOL_CONSTANT macro was intended to indicate whether or not the bool_constant alias template (defined in <type_traits>) is provided by the native standard library. It has since been discovered that, as bsl::integral_constant is actually a distinct class template derived from std::integral_constant, there must always be a distinct bsl alias template, which will be provided in a future BDE release. Given this new direction, the need for a macro for the native type is obviated so BSLS_LIBRARYFEATURES_HAS_CPP17_BOOL_CONSTANT is being removed. BSLS_LIBRARYFEATURES_HAS_CPP17_RANGE_FUNCTIONS macro is defined if the following functions are provided by the native standard library in the <iterator> header: template <class C> auto empty(const C& c) -> decltype(c.empty()); template <class C> auto data(const C& c) -> decltype(c.data()); template <class C> auto size(const C& c) -> decltype(c.size());
BSLS_LIBRARYFEATURES_HAS_CPP17_ALIGNED_ALLOC macro is defined if the native standard library provides std::aligned_alloc. BSLS_LIBRARYFEATURES_HAS_CPP17_TIMESPEC_GET macro is defined if the native standard library provides std::timespec_get. BSLS_LIBRARYFEATURES_HAS_CPP17_SPECIAL_MATH_FUNCTIONS is defined if the special math functions such as std::assoc_laguerre, std::beta and others are provided by the native standard library in the <cmath> header. BSLS_LIBRARYFEATURES_HAS_CPP17_INT_CHARCONV macro is defined if the native standard library provides the <charconv> header and implements both std::from_chars and std::to_chars for all standard signed and unsigned integer types and the char type, as well as the std::to_chars_result and std::from_chars_result types. BSLS_LIBRARYFEATURES_HAS_CPP17_CHARCONV macro is defined if the native standard library provides the <charconv> header and implements all required content with no major issues. This macro is defined in addition to the BSLS_LIBRARYFEATURES_HAS_CPP17_INT_CHARCONV macro when the native standard library also implements the std::chars_format enumeration, and both std::from_chars and std::to_chars functions for all 3 standard floating point types (float, double, long double). BSLS_LIBRARYFEATURES_HAS_CPP17_FILESYSTEM macro is defined if the native standard library provides the <filesystem> header and implements all required content with no major issues. BSLS_LIBRARYFEATURES_HAS_CPP20_VERSION macro is defined if the native standard library provides the <version> header and implements all required content with no major issues. BSLS_LIBRARYFEATURES macros should be based on the standard feature test macro when it is appropriate. See the "STANDARD FEATURE-DETECTION MACROS" section below. BSLS_LIBRARYFEATURES_HAS_CPP20_BARRIER macro is defined if the native standard library provides the <barrier> header and implements all required content with no major issues. __cpp_lib_barrier feature-test macro is defined. BSLS_LIBRARYFEATURES_HAS_CPP20_LATCH macro is defined if the native standard library provides the <latch> header and implements all required content with no major issues. __cpp_lib_latch feature-test macro is defined. BSLS_LIBRARYFEATURES_HAS_CPP20_RANGES macro is defined if the native standard library provides the <ranges> header and implements all required content with no major issues. __cpp_lib_ranges feature-test macro is defined. BSLS_LIBRARYFEATURES_HAS_CPP20_SEMAPHORE macro is defined if the native standard library provides the <semaphore> header and implements all required content with no major issues. __cpp_lib_semaphore feature-test macro is defined. BSLS_LIBRARYFEATURES_HAS_CPP20_STOP_TOKEN macro is defined if the native standard library provides the <stop_token> header and implements all required content with no major issues. __cpp_lib_jthread feature-test macro is defined. BSLS_LIBRARYFEATURES_STDCPP_GNU macro is defined if the C++ standard library implementation is GNU libstdc++. BSLS_LIBRARYFEATURES_STDCPP_IBM macro is defined if the C++ standard library implementation is IBM's VACPP. BSLS_LIBRARYFEATURES_STDCPP_INTELLISENSE macro is defined if Microsoft's Intellisense is running (instead of a production compiler). Note that detecting Intellisense does not mean that the MSVC compiler is used. Visual Studio 2017 is capable of cross platform development using clang and Visual Studio Code (also featuring Intellisense) may be used with virtually any compiler. BSLS_LIBRARYFEATURES_STDCPP_LLVM_LIBCPP macro is defined if the C++ standard library implementation is LLVM's libc++. BSLS_LIBRARYFEATURES_STDCPP_MSVC macro is defined if the C++ standard library implementation is Microsoft's (Dinkumware based) implementation. BSLS_LIBRARYFEATURES_STDCPP_LIBCSTD macro is defined if the C++ standard library implementation is a RogueWave implementation. BSLS_LIBRARYFEATURES_STDCPP_STLPORT macro is defined if the C++ standard library implementation is an STLPort implementation. tuple-type is not available in older versions of the native standard library. Suppose we have a utility component that returns an instance of a tuple of values if the underlying version of the standard library provides that type, and yet remain compilable otherwise. std::tuple. #if defined(BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE) # ifndef INCLUDED_TUPLE # include <tuple> # define INCLUDED_TUPLE # endif #endif // BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE
struct MyStatisticalUtil { static double mean(const int *begin, const int *end); static int median(const int *begin, const int *end); static double variance(const int *begin, const int *end); // Return the median (mean, variance) of the sequence of values in // the specified non-empty, semi-open range '[begin, end)'. The // behavior is undefined unless 'begin < end'.
bsl::type, if that type is available. Note that, if all three values are needed, calling this interface is more efficient than calling the earlier three individually because the input need be traversed one time, not three. #ifdef BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE static std::tuple<int, double, double> getMedianMeanVariance( const int *begin, const int *end); // Return the median, mean, and variance (in that order) of the // sequence of values in the specified non-empty, semi-open range // '[begin, end)'. The behavior is undefined unless 'begin < end'. #endif // BSLS_LIBRARYFEATURES_HAS_CPP11_TUPLE };
tuple type, and those that do not. Of course, in the later case the interface that returns | const char* bsls_libraryfeatures_CPP17_ABI |
1.7.1