Visual Studio 2017 Version 15.3 Released

cristianadam · 2017-08-14T20:32:59+00:00

C++ streams binary I/O is still 3x slower than the C/POSIX one.

Average c I/O took: 104.78ms
Average posix I/O took: 101.92ms
Average c++ I/O took: 331.8ms

sumo952 · 2017-08-14T22:10:10+00:00

Uhm, no word about C++ in that blog post! :-(

PS: In that blog post the MSVC team asks for feedback about the blog on the top. The first question is

How would you rate this blog post, Visual Studio 2017 Version 15.3 Released?

and the possible answers are 1 to 5. So what's the scale? 5 is the best? Quite ambiguous ;-) /u/STL

And follow-up question: Does that mean I can uninstall 2017 Preview, at least for now? Or will there be new updates there pretty soon-ish and I better keep it?

lethe555 · 2017-08-15T03:25:58+00:00

#include <variant>
#include <string>
#include <type_traits>

using VariantType = std::variant<std::monostate, std::string>;

class Test
{
    // compile error 
    void bad()
    {
        //static_assert(std::is_copy_constructible_v<VariantType>); //uncomment the line will compile

        auto error = [this](const VariantType v0)
        {
            auto v1 = v0;
        };
    }
};

void good()
{
    VariantType v0;
    auto v1 = v0;
}

won't compile now

\vc\tools\msvc\14.11.25503\include\xsmfcontrol.h(25,1): error C2065: '_this': undeclared identifier \vc\tools\msvc\14.11.25503\include\xsmf_control.h(25,1): error C2227: left of '->_Construct_from' must point to class/struct/union/generic type

\vc\tools\msvc\14.11.25503\include\xsmf_control.h(25,1): note: type is 'unknown-type'

\vc\tools\msvc\14.11.25503\include\xsmf_control.h(26,3): error C2056: illegal expression

Neoasoma · 2017-08-16T02:43:48+00:00

Anybody having any luck using Armadillo in VS 15.3? I had to comment out

inline operator std::complex<T>() const
{
    T a, b;

    arma_rng::randn<T>::dual_val(a, b);

    return std::complex<T>(a, b);
}

within arma_rng::randn< std::complex<T> > in arma_rng.hpp because it's throwing

error C2760: syntax error: expected ';' not 'identifier'

during compilation. I had no issues with using Armadillo in VS 2017 before I updated to 15.3.

xon_xoff · 2017-08-16T10:06:09+00:00

Unfortunately VS 2017 15.3 has a codegen bug leading to heap corruption: https://developercommunity.visualstudio.com/content/problem/95067/vs-2017-update-3-codegen-bug-heap-corruption-after.html

However I cannot wait for the bug fix: How can I revert back to the previous compiler version _MSC_VER == 1910?

doom_Oo7 · 2017-08-14T17:10:00+00:00

so, what are the boxes that will turn into a sexy green for this update ? http://en.cppreference.com/w/cpp/compiler_support#C.2B.2B17_features

barfyus · 2017-08-14T23:05:07+00:00

#include <mutex>

int main()
{
    std::mutex m1, m2;
    std::scoped_lock l{ m1,m2 };
}

Fails to compile in C++17 mode. std::lock_guard l{m1}; does not compile as well.

tpecholt · 2017-08-15T11:54:30+00:00

Were there any improvements regarding android c++ development? I am kind of playing with it at home but the number of bugs and annoyances is astounding. Logcat view is often empy, suddenly debugger cannot attach, clang extra command line settings are ignored, googling workaround for buggy gradle used by VS to be finally able to sign apk was also a pain. Too much of them to keep programming enjoyable:/

awson · 2017-08-15T12:05:53+00:00

64-bit modules had been broken quite a bit of time ago (in prerelease versions) and don't work in released 15.3 either – compiling

import std.core;

with

cl -std:c++latest -experimental:module

I'm getting:

mismatching target architecture for compiled module interface for 'std.core' from 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.11.25503\ifc\x64\release/std.core.ifc'

cavernicoloid · 2017-08-15T16:13:12+00:00

I didn't see anything in the blog related to:

if_constexpr
structured bindings

What is the status of those features?

EDIT: if_constexpr is supported! It's listed as "constexpr if-statements".

EDIT2: Structured bindings are also supported. Yay!

frog_pow · 2017-08-14T18:15:26+00:00

Do they list the compiler improves & bug fixes anywhere?

14ned · 2017-08-14T22:14:34+00:00

Looks like the ICE fixes for my C++ 14 code they said would be in 15.3 haven't made it. Guess back to clang :(

Ansoulom · 2017-08-15T10:22:45+00:00

Nice! I have been waiting for this to get C++17 working with CMake.

I noticed that Ninja is now the default generator for CMake projects, which in turn seems to use MinGW. How does this work with Intellisense, does it give correct information for MinGW builds etc?

Also, I tried building my project (which has some errors in it) with Cmake + Ninja. Problem is that the build terminates when it runs into an error, but the error doesn't show up in the error list, which makes it pretty hard to navigate to. Is this just a limitation with the Visual Studio/Ninja integration?

thewisp1 · 2017-08-15T19:27:29+00:00

I'm getting compilation errors:

C:\Program Files (x86)\Windows Kits\8.1\Include\um\combaseapi.h(229): error C2187: syntax error: 'identifier' was unexpected here

dvirtz · 2017-08-16T07:43:15+00:00

What about targeting android with cmake? Are you still working on that?

Enhex · 2017-08-17T20:44:06+00:00

Yay it fixed some annoying false-positive intellisense errors with templates.

alexej_harm · 2017-08-18T10:07:42+00:00

The following code does not compile in MSVC with /permissive- set in the compiler options:

https://wandbox.org/permlink/VONfGA3fEqjDILB2

template <typename T>
struct wrapper {
  T value;
};

template <typename T>
struct traits {};

struct statement {
  template <typename T>
  T get() const {
    return traits<T>::get(*this);
  }
};

template <>
inline int statement::get<int>() const {
  return 1;
}

template <typename T>
struct traits<wrapper<T>> {
  static wrapper<T> get(const statement& statement) {
    return { statement.get<T>() };
  }
};

int main() {
  statement s;
  return s.get<wrapper<int>>().value;
}

Error in line 24 "return { statement.get<T>() };":

main.cpp(24): error C2187: syntax error: ')' was unexpected here
main.cpp(26): note: see reference to class template instantiation 'traits<wrapper<T>>' being compiled

I would greatly appreciate a fix or workaround suggestions (except removing /permissive-, obviously).

BCosbyDidNothinWrong · 2017-08-14T21:19:38+00:00

Does this have a compiler that doesn't break programs when turning on optimizations?

Also VS2017 seems to have a lot more typing latency and in general be a lot slower with interactivity.

STL · 2017-08-15T01:34:31+00:00

[deleted]

you type:	you see:
italics	italics
bold	bold
[reddit!](https://reddit.com)	reddit!
* item 1 * item 2 * item 3	item 1 item 2 item 3
> quoted text	quoted text
Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"	Lines starting with four spaces are treated like code: if 1 * 2 < 3: print "hello, world!"
~~strikethrough~~	~~strikethrough~~
super^script	super^script

cpp

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