Quick Q: Why does emplace_back need a (copy or) move constructor? -- StackOverflow

By Blog Staff | Mar 25, 2013 03:04 PM | Tags: None

Quick A: It needs it when the container is a vector or similar, because the container may need to grow and reallocate which includes moving or copying the existing contents to the new location.

why does emplace_back need move constructor?

I have the following code... But the emplace_back doesn't use the move constructor. Why does the initialization require a move constructor in this instance?

Quick Q: How do you enable C++11 support on Android? -- StackOverflow

By Blog Staff | Mar 25, 2013 11:08 AM | Tags: None

C++11 support is already available by default in many environments and platforms, but as it reaches new ones you may still need to turn it on explicitly. Android is an example:

Enable C++11 support on Android

How do I integrate C++11 in Android in order to use unordered_map (the new version of hash_map)?

Quick Q: Does [=] imply that all local variables will be copied? -- StackOverflow

By Blog Staff | Mar 25, 2013 10:01 AM | Tags: None

Quick A: No, only the ones you actually use.

From StackOverflow:

Does [=] imply that all local variables will be copied?

When I write a lambda with [=], does it mean that all my local variables will be copied into members of the created struct or can I assume that only those will that are actually used in the lambda?

Qt Creator 2.7.0: More C++11, and C++11 Now Default

By Blog Staff | Mar 24, 2013 02:07 PM | Tags: None

Qt Creator 2.7.0 is now available, and includes more C++11 support including that C++11 mode is now on by default.

Qt Creator 2.7.0 Released

by Eike Ziller

C++ support in Qt Creator got even more improvements for C++11, like handling of alignof, alignas and noexcept, brace initializers, and more lambda fixes. Also, if Qt Creator cannot find out if your tool chain expects C++11 or C++98/03, it defaults to C++11 now, for a better out of the box experience.

GCC's Move to C++ -- Linda Jacobsen

By Blog Staff | Mar 24, 2013 11:46 AM | Tags: None

It's nice to see more C++ compilers being written in C++ rather than C. The Clang compiler is already all-C++. In recent years GCC has been slowly doing the same -- first compiling the C code as C++ code, and more recently using C++ itself.

Here is a readable summary of progress to date.

GCC's Move to C++

by Linda Jacobsen

Excerpt:

In 2008, 2009, and 2010, (i.e., at the beginning and after each milestone) Taylor provided formal plans for the next steps. There is no formal plan going forward from here. People will use C++ constructs in future patches as they deem necessary, but not just for the sake of doing so. Some will limit their changes to the times when they are patching the code anyway. Others approach the existing C code with an eye to converting code to C++ wherever it makes the code clearer or more efficient. Therefore, this is an ongoing effort on a meandering path for the foreseeable future.

GCC 4.8 released

By Blog Staff | Mar 22, 2013 05:48 PM | Tags: None

GCC 4.8 has been released. C++-related improvements include the following highlights.

Language improvements:

• G++ now implements the C++11 thread_local keyword...
• G++ now implements the C++11 attribute syntax, e.g.
    [[noreturn]] void f();
  and also the alignment specifier, e.g.
    alignas(double) int i;
• G++ now implements C++11 inheriting constructors, e.g.
    struct A { A(int); };
  struct B: A { using A::A; }; // defines B::B(int)
  B b(42); // OK
• G++ now supports a -std=c++1y option for experimentation with features proposed for the next revision of the standard, expected around 2017. Currently the only difference from -std=c++11 is support for return type deduction in normal functions, as proposed in N3386.
• The G++ namespace association extension, __attribute ((strong)), has been deprecated. Inline namespaces should be used instead.

Standard library improvements:

Improved experimental support for the new ISO C++ standard, C++11, including:

• forward_list meets the allocator-aware container requirements;
• this_thread::sleep_for(), this_thread::sleep_until() and this_thread::yield() are defined without requiring the configure option --enable-libstdcxx-time;
• SSE optimized normal_distribution and simd_fast_mersenne_twister_engine.
• Use of hardware RNG instruction for random_device on new x86 processors (requires the assembler to support the instruction.)

Webinar: C++ in the Multi-Device Enterprise -- David Intersimone

By David I | Mar 20, 2013 03:36 PM | Tags: intermediate basics

On Tuesday, March 26, Embarcadero's David Intersimone will be speaking live on the web:

C++ in the Multi-Device Enterprise

David Intersimone, "David I"
Vice President of Developer Relations and Chief Evangelist

Tuesday, March 26, 2013

• 6:00AM PDT / 9:00AM EDT / 13:00 UTC
• 11:00AM PDT / 2:00PM EDT / 18:00 UTC
• 5:00PM PDT / 8:00PM EDT / 11:00AM 27-Mar Australia EDT

Description:

In every conversation, social network post and industry article, you hear about the need for multi-device support inside an Enterprise.  Terms like BYOD appear in most articles and Enterprise strategies.  Computing in a modern Enterprise is not only a Microsoft Windows world.  Enterprise organizations need to support a wide array of devices that their employees are using to be more productive.  The modern enterprise also needs to support additional software architectures including Cloud computing, multi-tier, REST and SOAP web services and more.

This webinar showcases how C++ can help satisfy the Enterprise’s need to support multiple devices on desktops, servers, web, mobile and multi-tiers in their infrastructure.  Coverage includes C++Builder’s support for ISV and enterprise class integrated database, middleware and cloud computing. With C++Builder XE3, you get integrated support for SQL Server, Oracle, Sybase, DB2, InterBase, SQL Anywhere, SQLite, MySQL, and cloud services including Windows Azure and Amazon.

During the webinar, you will learn how to:

• Leverage platform services, devices and sensors in your multi-device C++ applications
• Build multi-device C++ applications that connect with enterprise SQL databases
• Create multi-device C++ desktop applications that consume web services using SOAP and REST
• Build scalable multi-tier, multi-device, master detail database applications

Clang/LLVM developer conference sold out

By Blog Staff | Mar 20, 2013 09:23 AM | Tags: None

As noted yesterday, the C++ Now 2013 conference has sold out well in advance. There's one other conference that sold out almost immediately we should also mention:

For those interested in developing for the Clang C++ compiler and its LLVM back-end, the Third Annual European LLVM Conference (announced here Jan 16) also sold out quickly -- all confirmed attendees received their confirmation mail at the end of January. If you didn't receive that mail in January, you can still add yourself to the waiting list in case some spots become available.

If you missed registering for C++ Now or the Clang/LLVM Conference, check out additional C++ events coming up around the world in the Upcoming Events section on the sidebar.

C++ Now 2013 sold out

By Blog Staff | Mar 19, 2013 07:55 PM | Tags: None

As interest in C++ continues to increase, not only are we seeing more C++ events, but they're selling out quickly.

C++ Now (formerly BoostCon) just reported it is sold out with 53 days to go.

If you missed registering for C++ Now, check out additional C++ events coming up around the world in the Upcoming Events section on the sidebar.

Pre-Bristol standards papers mailing available

By Blog Staff | Mar 19, 2013 12:13 PM | Tags: None

The official pre-meeting standards papers mailing is now available. It includes the spring meeting agenda, updated issues lists, and a number of new papers including at least one that came through the public std-proposals forum. (Update: Please also direct discussion about these papers to that forum.)

Note: Most or all of these papers have also been posted already to this site's Standardization RSS feed.