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C++17

From cppreference.com
< cpp

Following features were merged into C++17:

  1. From TS's: the filesystem library, the library fundamentals v1 (including optional, any, string_view, polymorphic allocators, searchers, apply), parallelism v1 (including execution policies, reduce, inclusive_scan, exclusive_scan), but removing exception_list. From special function IS: mathematical special functions, from library fundamentals v2: std::gcd, std::lcm
  2. From C11: std::aligned_alloc, std::timespec_get

Contents

[edit] Obsolete

Removed

auto_ptr, deprecated function objects, std::random_shuffle, std::unexpected, the obsolete iostreams aliases, trigraphs, the register keyword, bool increment

Deprecated

std::iterator, std::raw_storage_iterator, std::get_temporary_buffer, std::is_literal_type, std::result_of, all of <codecvt>

[edit] New language features

[edit] New headers

[edit] New library features

[edit] In utility

[edit] In memory



[edit] In types

[edit] In algorithm

[edit] container related

[edit] In numeric

[edit] Other

[edit] Defect reports

Defect Reports fixed in C++17 (289 core, 281 library)

[edit] Compiler support

Main Article: C++ compiler support

[edit] C++17 core language features

C++17 feature
 
Paper(s)
 
GCC
Clang
MSVC
Apple Clang
EDG eccp
Intel C++
IBM XLC++
Sun/Oracle C++
Embarcadero C++ Builder
Cray
Portland Group (PGI)
Nvidia nvcc
New auto rules for direct-list-initialization N3922 5 3.8 19.0* Yes 4.10.1 17.0 10.3 17.7
static_assert with no message N3928 6 2.5 19.10* Yes 4.12 18.0 10.3 17.7
typename in a template template parameter N4051 5 3.5 19.0* Yes 4.10.1 17.0 10.3 17.7
Removing trigraphs N4086 5 3.5 16.0* Yes 5.0 10.3 19.1
Nested namespace definition N4230 6 3.6 19.0* Yes 4.12 17.0 10.3 17.7
Attributes for namespaces and enumerators N4266 4.9 (partial)*
6
3.6 19.0* Yes 4.11 17.0 10.3 17.7
u8 character literals N4267 6 3.6 19.0* Yes 4.11 17.0 10.3 17.7
Allow constant evaluation for all non-type template arguments N4268 6 3.6 19.12* Yes 5.0 19.0.1 10.3 19.1
Fold Expressions N4295 6 3.6 19.12* Yes 4.14 19.0 10.3 18.1
Unary fold expressions and empty parameter packs P0036R0 6 3.9 19.12* Yes 4.14 10.3 19.1
Remove Deprecated Use of the register Keyword P0001R1 7 3.8 19.11* Yes 4.13 18.0 10.3 17.7
Remove Deprecated operator++(bool) P0002R1 7 3.8 19.11* Yes 4.13 18.0 10.3 17.7
Make exception specifications part of the type system P0012R1 7 4 19.12* Yes 4.14 19.0 10.3 19.1
Aggregate initialization of classes with base classes P0017R1 7 3.9 19.14* Yes 5.0 19.0.1 10.3 19.1
__has_include in preprocessor conditionals P0061R1 5 Yes 19.11* Yes 4.13 18.0 10.3 17.7
DR: New specification for inheriting constructors (DR1941 et al) P0136R1 7 3.9 19.14* Yes 10.3 19.1
Lambda capture of *this P0018R3 7 3.9 19.11* Yes 4.14 19.0 10.3 18.1
Direct-list-initialization of enumerations P0138R2 7 3.9 19.11* Yes 4.14 18.0 10.3 19.1
constexpr lambda expressions P0170R1 7 5 19.11* Yes 4.14 19.0 10.3 18.1
Differing begin and end types in range-based for P0184R0 6 3.9 19.10* Yes 4.12 18.0 10.3 17.7
[[fallthrough]] attribute P0188R1 7 3.9 19.10* Yes 4.13 18.0 10.3 17.7
[[nodiscard]] attribute P0189R1 7 3.9 19.11* Yes 4.13 18.0 10.3 17.7
[[maybe_unused]] attribute P0212R1 7 3.9 19.11* Yes 4.13 18.0 10.3 17.7
Hexadecimal floating-point literals P0245R1 3.0 Yes 19.11* Yes 4.13 18.0 10.3 17.7
Using attribute namespaces without repetition P0028R4 7 3.9 19.11* Yes 4.13 18.0 10.3 17.7
Dynamic memory allocation for over-aligned data P0035R4 7 4 19.12*

10.0.0*

4.14 19.0 10.3 19.1
Class template argument deduction P0091R3 7 5 19.14* Yes 5.0 19.0.1 10.3 19.1
Non-type template parameters with auto type P0127R2 7 4 19.14* Yes 5.0 19.0.1 10.3 19.1
Guaranteed copy elision P0135R1 7 4 19.13* Yes 5.0 19.0.1 10.3 19.1
Replacement of class objects containing reference members P0137R1 7 6 19.14* Yes 5.0 10.3 19.1
Stricter expression evaluation order P0145R3 7 4 19.14* Yes 5.0 19.0.1 10.3 19.1
Structured Bindings P0217R3 7 4 19.11* Yes 4.14 19.0 10.3 18.1
Ignore unknown attributes P0283R2 Yes 3.9 19.11* Yes 4.13 18.0 10.3 17.7
constexpr if statements P0292R2 7 3.9 19.11* Yes 4.14 19.0 10.3 18.1
init-statements for if and switch P0305R1 7 3.9 19.11* Yes 4.14 18.0 10.3 18.1
Inline variables P0386R2 7 3.9 19.12* Yes 4.14 19.0 10.3 18.1
Removing Deprecated Exception Specifications from C++17 P0003R5 7 4 19.10* Yes 4.14 19.0 10.3 19.1
Pack expansions in using-declarations P0195R2 7 4 19.14* Yes 5.0 19.0 10.3 19.1
DR: Matching of template template-arguments excludes compatible templates P0522R0 7 4 19.12* Yes 5.0 19.0.1 10.3 19.1
C++17 feature
 
Paper(s)
 
GCC
Clang
MSVC
Apple Clang
EDG eccp
Intel C++
IBM XLC++
Sun/Oracle C++
Embarcadero C++ Builder
Cray
Portland Group (PGI)
Nvidia nvcc

[edit] C++17 library features

C++17 feature
 
Paper(s)
 
GCC libstdc++
Clang libc++
MSVC
Standard Library
Apple Clang
Intel Parallel STL
Sun/Oracle C++
Standard Library
Embarcadero C++ Builder
Standard Library
Cray C++
Standard Library
std::void_t N3911 6 3.6 19.0* Yes N/A 10.3
std::uncaught_exceptions() N4259 6 3.7 19.0* Yes N/A
std::size(), std::empty() and std::data() N4280 6 3.6 19.0* Yes N/A 10.3
Improving std::pair and std::tuple N4387 6 4 19.0* Yes N/A 10.3
std::bool_constant N4389 6 3.7 19.0* Yes N/A 10.3
std::shared_mutex (untimed) N4508 6 3.7 19.0* Yes N/A 10.3
Type traits variable templates P0006R0 7 3.8 19.0* Yes N/A 10.3
Logical operator type traits P0013R1 6 3.8 19.0* Yes N/A 10.3
Standardization of Parallelism TS P0024R2 9* 19.14* 18.0*
std::clamp() P0025R0 7 3.9 19.0*

10.0.0*

N/A 10.3
Hardware interference size P0154R1 19.11* N/A
(nothrow-)swappable traits P0185R1 7 3.9 19.0*

10.0.0*

N/A 10.3
File system library P0218R1 8 7 19.14*

11.0.0*

N/A 10.3
std::string_view N3921
P0220R1
7 4 19.10*

10.0.0*

N/A 10.3
std::any P0220R1 7 4 19.10*

10.0.0*

N/A 10.3
std::optional P0220R1 7 4 19.10*

10.0.0*

N/A 10.3
Polymorphic memory resources P0220R1 9 19.13* N/A 10.3
Mathematical special functions P0226R1 7 19.14* N/A 10.3
C++17 should refer to C11 instead of C99 P0063R3 9 7 19.0*
(partial)*
N/A
Splicing Maps and Sets P0083R3 7 8 19.12*

10.0.0*

N/A
std::variant P0088R3 7 4 19.10*

10.0.0*

N/A 10.3
std::make_from_tuple() P0209R2 7 3.9 19.10* Yes N/A 10.3
std::has_unique_object_representations P0258R2 7 6 19.11* Yes N/A 10.3
std::gcd() and std::lcm() P0295R0 7 4 19.11* Yes N/A 10.3
std::not_fn P0005R4
P0358R1
7 3.9 19.12* Yes N/A 10.3
Elementary string conversions P0067R5 8 (no FP) 7 (no FP) 19.14* (no FP)*
19.24*
N/A
std::shared_ptr and std::weak_ptr with array support P0414R2 7 19.12* N/A 10.3
std::scoped_lock P0156R2 7 5 19.11* Yes N/A 10.3
std::byte P0298R3 7 5 19.11* Yes N/A 10.3
std::is_aggregate LWG2911 7 5 19.15* Yes N/A 10.3
C++17 feature
 
Paper(s)
 
GCC libstdc++
Clang libc++
MSVC
Standard Library
Apple Clang
Intel Parallel STL
Sun/Oracle C++
Standard Library
Embarcadero C++ Builder
Standard Library
Cray C++
Standard Library

* - hover over the version number to see notes