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Why no std::byte in qt?!!

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  • EngelardE Offline
    EngelardE Offline
    Engelard
    wrote on last edited by Engelard
    #9

    Just tell me what should i do to be able to use std::byte in qt...

    P.S. this topic for some reason became 'auto topic', but this keyword wont work for my case because it can't convert in proper 'raw byte' type because there is no such thing in my Qt(yet).

    VRoninV 1 Reply Last reply
    0
    • EngelardE Engelard

      @JohanSolo said in Why no std::byte in qt?!!:

      Well, Qt is no compiler... it's a framework. Therefore the argument holds.

      I don't understand. Each IDA must have it's own compiler, no?

      K Offline
      K Offline
      kenchan
      wrote on last edited by kenchan
      #10

      @Engelard
      No, the Qt IDE is not a compiler, it provides you with the ability to use whatever compiler you have installed and is compatible with the version of Qt you are using.
      In the case of the VS IDE it just happens to be provided by Microsoft and they also provide their own compiler as part of the package. That is just the way it is!

      If you want to use the c++17 features in Qt Creator you must tell the compiler you want to use it by putting CONFIG += c++17 in your pro file.
      EDIT:
      Another way to make it use the c++17 features is to add QMAKE_CXXFLAGS += -std:c++17 this should be equivalent to the above if you use the correct compiler.
      I think it will only work the the 15.0 compiler, I tried it with the 14.0 compiler and the complier did not like it. I don't use Qt with the 15.0 version yet so I can't test that.

      EngelardE 1 Reply Last reply
      6
      • EngelardE Engelard

        Just tell me what should i do to be able to use std::byte in qt...

        P.S. this topic for some reason became 'auto topic', but this keyword wont work for my case because it can't convert in proper 'raw byte' type because there is no such thing in my Qt(yet).

        VRoninV Offline
        VRoninV Offline
        VRonin
        wrote on last edited by
        #11

        @Engelard said in Why no std::byte in qt?!!:

        what should i do to be able to use std::byte in qt

        Just chose as a compiler VS 2017.3 [P2] or later (i.e. the compiler 15.0)

        Each IDA must have it's own compiler, no?

        Absolutely not.

        this topic for some reason became 'auto topic',

        Forked to https://forum.qt.io/topic/95412/rants-about-auto

        "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
        ~Napoleon Bonaparte

        On a crusade to banish setIndexWidget() from the holy land of Qt

        1 Reply Last reply
        3
        • K kenchan

          @Engelard
          No, the Qt IDE is not a compiler, it provides you with the ability to use whatever compiler you have installed and is compatible with the version of Qt you are using.
          In the case of the VS IDE it just happens to be provided by Microsoft and they also provide their own compiler as part of the package. That is just the way it is!

          If you want to use the c++17 features in Qt Creator you must tell the compiler you want to use it by putting CONFIG += c++17 in your pro file.
          EDIT:
          Another way to make it use the c++17 features is to add QMAKE_CXXFLAGS += -std:c++17 this should be equivalent to the above if you use the correct compiler.
          I think it will only work the the 15.0 compiler, I tried it with the 14.0 compiler and the complier did not like it. I don't use Qt with the 15.0 version yet so I can't test that.

          EngelardE Offline
          EngelardE Offline
          Engelard
          wrote on last edited by
          #12

          @kenchan said in Why no std::byte in qt?!!:

          I think it will only work the the 15.0 compiler, I tried it with the 14.0 compiler and the complier did not like it. I don't use Qt with the 15.0 version yet so I can't test that.

          Did'nt work out((

          @VRonin said in Why no std::byte in qt?!!:

          Just chose as a compiler VS 2017.3 [P2] or later (i.e. the compiler 15.0)

          Which one should i choose?:

          alt text

          And then. Where and for what exactly file should i looking at? Can i add same compiler from my VS2017?

          VRoninV 1 Reply Last reply
          0
          • EngelardE Engelard

            @kenchan said in Why no std::byte in qt?!!:

            I think it will only work the the 15.0 compiler, I tried it with the 14.0 compiler and the complier did not like it. I don't use Qt with the 15.0 version yet so I can't test that.

            Did'nt work out((

            @VRonin said in Why no std::byte in qt?!!:

            Just chose as a compiler VS 2017.3 [P2] or later (i.e. the compiler 15.0)

            Which one should i choose?:

            alt text

            And then. Where and for what exactly file should i looking at? Can i add same compiler from my VS2017?

            VRoninV Offline
            VRoninV Offline
            VRonin
            wrote on last edited by
            #13

            @Engelard said in Why no std::byte in qt?!!:

            Did'nt work out((

            What did you do?

            "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
            ~Napoleon Bonaparte

            On a crusade to banish setIndexWidget() from the holy land of Qt

            EngelardE 1 Reply Last reply
            0
            • VRoninV VRonin

              @Engelard said in Why no std::byte in qt?!!:

              Did'nt work out((

              What did you do?

              EngelardE Offline
              EngelardE Offline
              Engelard
              wrote on last edited by Engelard
              #14

              @VRonin like @kenchan said, add in to .pro file one of these:

              CONFIG += c++17
              QMAKE_CXXFLAGS += -std:c++17
              

              Non of them worked. Still no byte type in std::

              kkoehneK K 2 Replies Last reply
              0
              • VRoninV Offline
                VRoninV Offline
                VRonin
                wrote on last edited by
                #15

                Can you show us what kit are you building with? see image below:
                0_1539108183391_Capture.png

                "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                ~Napoleon Bonaparte

                On a crusade to banish setIndexWidget() from the holy land of Qt

                EngelardE 1 Reply Last reply
                0
                • VRoninV VRonin

                  Can you show us what kit are you building with? see image below:
                  0_1539108183391_Capture.png

                  EngelardE Offline
                  EngelardE Offline
                  Engelard
                  wrote on last edited by
                  #16

                  @VRonin I just added first manual compiler, which from folder of my VS2017 Community, still it says that byte is not part of std.

                  alt text

                  Here it is:

                  alt text

                  Did i did that correct?

                  VRoninV 1 Reply Last reply
                  0
                  • EngelardE Offline
                    EngelardE Offline
                    Engelard
                    wrote on last edited by Engelard
                    #17

                    Oh and in the Kits i just now noticed, for some reason there is compilers for amd chosen, when i have normal for intel i suppose in my VS. And i can't change it, when i press manage - it's simply throw me in to compilers tab so i don't know how to change it:

                    alt text

                    AND. i just now added one more custom compiler, also from VS2017 but 64 version, since i have x64 CPU and windows, maybe should be proper one, am i right?

                    alt text

                    Only one thing (as i understand) left to do. Is apply compiler which i chose in 'compilers' tab, because there is still my old as you can see from screenshot

                    alt text

                    jsulmJ kshegunovK 2 Replies Last reply
                    0
                    • EngelardE Engelard

                      Oh and in the Kits i just now noticed, for some reason there is compilers for amd chosen, when i have normal for intel i suppose in my VS. And i can't change it, when i press manage - it's simply throw me in to compilers tab so i don't know how to change it:

                      alt text

                      AND. i just now added one more custom compiler, also from VS2017 but 64 version, since i have x64 CPU and windows, maybe should be proper one, am i right?

                      alt text

                      Only one thing (as i understand) left to do. Is apply compiler which i chose in 'compilers' tab, because there is still my old as you can see from screenshot

                      alt text

                      jsulmJ Online
                      jsulmJ Online
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by jsulm
                      #18

                      @Engelard "How your argument should work?" - easy. You should understand the difference between a compiler, an IDE and a framework. Qt is a C++ framework (not a compiler), QtCreator is an IDE which supports many different compilers, but does not contain own compilers. C++standard library (std::*) comes as part of the compiler and NOT Qt, that's why it is "completely unrelated to Qt". So, as already explained by others you need a compiler supporting C++2017 and activate C++2017 supports in the pro file (not sure it is needed with Microsoft compilers).

                      Didn't QtCreator auto-detect your VS2017 compiler? Usually there is no need to configure compilers manually. The 15.0 is already the C++ compiler from VS2017, why do you add the compiler manually? Does it now work with your "Desktop Qt 5.10.1 MSVC2017 64bit2" Kit and autodetected VS2017 compiler?

                      One note: an IDE does not have to contain any compilers. Microsoft Compilers can be installed and used without Visual Studio. The reasons are: it must be possible to use compilers without a huge IDE (for example in a continuous integration system) and many IDEs (like QtCreator) support different compilers which come from different companies or are open source. QtCreator, for example, supports Microsoft Compilers and MinGW on Windows. Qt Online Installer for Windows provides the possibility to install MinGW as it is Open Source. Microsoft compilers on the other hand can't be provided by Qt Online Installer as this not allowed by Microsoft.

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

                      1 Reply Last reply
                      5
                      • EngelardE Engelard

                        @VRonin I just added first manual compiler, which from folder of my VS2017 Community, still it says that byte is not part of std.

                        alt text

                        Here it is:

                        alt text

                        Did i did that correct?

                        VRoninV Offline
                        VRoninV Offline
                        VRonin
                        wrote on last edited by
                        #19

                        @Engelard said in Why no std::byte in qt?!!:

                        still it says that byte is not part of std.

                        • Did you #include <cstddef>?
                        • Can you open Visual Studio 2017, create a simple console program and test if it works there?

                        "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
                        ~Napoleon Bonaparte

                        On a crusade to banish setIndexWidget() from the holy land of Qt

                        EngelardE 1 Reply Last reply
                        1
                        • EngelardE Engelard

                          Oh and in the Kits i just now noticed, for some reason there is compilers for amd chosen, when i have normal for intel i suppose in my VS. And i can't change it, when i press manage - it's simply throw me in to compilers tab so i don't know how to change it:

                          alt text

                          AND. i just now added one more custom compiler, also from VS2017 but 64 version, since i have x64 CPU and windows, maybe should be proper one, am i right?

                          alt text

                          Only one thing (as i understand) left to do. Is apply compiler which i chose in 'compilers' tab, because there is still my old as you can see from screenshot

                          alt text

                          kshegunovK Offline
                          kshegunovK Offline
                          kshegunov
                          Moderators
                          wrote on last edited by
                          #20

                          @Engelard said in Why no std::byte in qt?!!:

                          there is compilers for amd chosen, when i have normal for intel i suppose in my VS

                          This is the CPU instruction set. Intel processors use amd64, so it's correct.

                          Read and abide by the Qt Code of Conduct

                          EngelardE 1 Reply Last reply
                          5
                          • EngelardE Engelard

                            @VRonin like @kenchan said, add in to .pro file one of these:

                            CONFIG += c++17
                            QMAKE_CXXFLAGS += -std:c++17
                            

                            Non of them worked. Still no byte type in std::

                            kkoehneK Offline
                            kkoehneK Offline
                            kkoehne
                            Moderators
                            wrote on last edited by
                            #21

                            @Engelard said in Why no std::byte in qt?!!:

                            CONFIG += c++17
                            QMAKE_CXXFLAGS += -std:c++17

                            Please try

                            CONFIG +=c++1z

                            This works for me with Visual Studio 2017 compiler.

                            Director R&D, The Qt Company

                            1 Reply Last reply
                            2
                            • EngelardE Engelard

                              @VRonin like @kenchan said, add in to .pro file one of these:

                              CONFIG += c++17
                              QMAKE_CXXFLAGS += -std:c++17
                              

                              Non of them worked. Still no byte type in std::

                              K Offline
                              K Offline
                              kenchan
                              wrote on last edited by kenchan
                              #22

                              @Engelard
                              OK, problem solved...
                              In spite the Microsoft docs which say the -std:c++17 flag can be used in VS2017 to enable the c++17 features it does not seem to work though the command line via qmake!
                              but adding...
                              DEFINES += _HAS_STD_BYTE
                              and
                              QMAKE_CXXFLAGS += -std:c++17
                              to the pro file does work and I can use std::byte in the code.

                              QMAKE_CXXFLAGS += -std:c++1z also worked

                              I hope this works for you too.

                              EngelardE 1 Reply Last reply
                              4
                              • VRoninV VRonin

                                @Engelard said in Why no std::byte in qt?!!:

                                still it says that byte is not part of std.

                                • Did you #include <cstddef>?
                                • Can you open Visual Studio 2017, create a simple console program and test if it works there?
                                EngelardE Offline
                                EngelardE Offline
                                Engelard
                                wrote on last edited by Engelard
                                #23

                                @VRonin said in Why no std::byte in qt?!!:

                                @Engelard said in Why no std::byte in qt?!!:

                                still it says that byte is not part of std.

                                • Did you #include <cstddef>?

                                Yes, i mentioned in firsts posts.

                                • Can you open Visual Studio 2017, create a simple console program and test if it works there?

                                In first post i told that original program which widely using std::byte was from my VS2017(ofc it works).

                                @kshegunov

                                This is the CPU instruction set. Intel processors use amd64, so it's correct.

                                lol

                                1 Reply Last reply
                                0
                                • kshegunovK kshegunov

                                  @Engelard said in Why no std::byte in qt?!!:

                                  there is compilers for amd chosen, when i have normal for intel i suppose in my VS

                                  This is the CPU instruction set. Intel processors use amd64, so it's correct.

                                  EngelardE Offline
                                  EngelardE Offline
                                  Engelard
                                  wrote on last edited by
                                  #24

                                  @kshegunov said in Why no std::byte in qt?!!:

                                  @Engelard said in Why no std::byte in qt?!!:

                                  there is compilers for amd chosen, when i have normal for intel i suppose in my VS

                                  This is the CPU instruction set. Intel processors use amd64, so it's correct.

                                  lol

                                  @kkoehne said in Why no std::byte in qt?!!:

                                  @Engelard said in Why no std::byte in qt?!!:

                                  CONFIG += c++17
                                  QMAKE_CXXFLAGS += -std:c++17

                                  Please try

                                  CONFIG +=c++1z

                                  This works for me with Visual Studio 2017 compiler.

                                  Sorry, no effect. Tried both of them, separately and together like in your message.

                                  1 Reply Last reply
                                  0
                                  • K kenchan

                                    @Engelard
                                    OK, problem solved...
                                    In spite the Microsoft docs which say the -std:c++17 flag can be used in VS2017 to enable the c++17 features it does not seem to work though the command line via qmake!
                                    but adding...
                                    DEFINES += _HAS_STD_BYTE
                                    and
                                    QMAKE_CXXFLAGS += -std:c++17
                                    to the pro file does work and I can use std::byte in the code.

                                    QMAKE_CXXFLAGS += -std:c++1z also worked

                                    I hope this works for you too.

                                    EngelardE Offline
                                    EngelardE Offline
                                    Engelard
                                    wrote on last edited by Engelard
                                    #25

                                    @kenchan damn it worked! At least now after typing std::b it advice me byte type and word now not dead black but violet like all valid variables should be(finally).

                                    But!)

                                    It still rejects to compile. I tried to clean all, then rebuild, but same error:

                                    alt text

                                    1 Reply Last reply
                                    0
                                    • EngelardE Offline
                                      EngelardE Offline
                                      Engelard
                                      wrote on last edited by
                                      #26

                                      Even restart of Qt don't help, what's wrong...

                                      K 1 Reply Last reply
                                      0
                                      • EngelardE Engelard

                                        Even restart of Qt don't help, what's wrong...

                                        K Offline
                                        K Offline
                                        kenchan
                                        wrote on last edited by kenchan
                                        #27

                                        @Engelard
                                        hmm?? looks like you have another problem somewhere.
                                        Can you show us your pro file?
                                        Can you show us a screen shot of your kits panel for the kit you are currently using again please?
                                        Can you show us a screen shot the qt versions panel and the compilers panel again please?
                                        Can can you show a screen shot of the compiler output when you compile your code with the std::byte declaration please?

                                        Thank you

                                        K EngelardE 2 Replies Last reply
                                        1
                                        • K kenchan

                                          @Engelard
                                          hmm?? looks like you have another problem somewhere.
                                          Can you show us your pro file?
                                          Can you show us a screen shot of your kits panel for the kit you are currently using again please?
                                          Can you show us a screen shot the qt versions panel and the compilers panel again please?
                                          Can can you show a screen shot of the compiler output when you compile your code with the std::byte declaration please?

                                          Thank you

                                          K Offline
                                          K Offline
                                          kenchan
                                          wrote on last edited by
                                          #28

                                          @Engelard
                                          I few tests show me that you can actually get away with using either DEFINES += _HAS_STD_BYTE or QMAKE_CXXFLAGS += -std:c++17 when using the VS 15.0 compiler.
                                          Using both is obviously twice as safe.

                                          Just make sure you blow away the build folder, rerun qmake and rebuild just to be sure.

                                          creating a new Non-Qt Plain C++ project with this pro file

                                           TEMPLATE = app
                                          CONFIG += console
                                          CONFIG -= app_bundle
                                          CONFIG -= qt
                                          DEFINES += _HAS_STD_BYTE
                                          QMAKE_CXXFLAGS += -std:c++17
                                           
                                          SOURCES += \
                                                  main.cpp
                                          

                                          and this c++ code worked fine for me.

                                          #include <iostream>
                                          #include <cstddef>
                                           
                                          using namespace std;
                                           
                                          int main()
                                          {
                                              byte stdbyte;
                                              stdbyte = std::byte(0);
                                              byte *arr = new std::byte[2];
                                              arr[0] = std::byte(0x2a);
                                           
                                              cout << "Hello World!" << endl;
                                              return 0;
                                          }
                                          

                                          Why don't you try this and see if it works?

                                          1 Reply Last reply
                                          4

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