Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. Why no std::byte in qt?!!
Forum Updated to NodeBB v4.3 + New Features

Why no std::byte in qt?!!

Scheduled Pinned Locked Moved Solved General and Desktop
31 Posts 8 Posters 9.1k Views 3 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • EngelardE Offline
    EngelardE Offline
    Engelard
    wrote on last edited by Engelard
    #1

    Situation:
    For last 3 hours i tried to figure out whats wrong with my code which i successfully ported in Qt. Now i find reason - qt betrayed me.

    I brought my code from VS to Qt. I runned it, everything seems fine,no errors in compile/runtime but program did'nt succeed. Then for next 3 hours i was looking where i made a mistake and found it.

    In vs i had

    using namespace std;
    

    for nicer code. But in Qt i forgot about that. So, as i understand Qt have it's own, embedded 'byte' type. And when i tried add prefix to my code like 'std::byte' compiler tells me "byte is not part of standard library".

    Wut? And then i goes to description of type, found that this type comes from <cstddef> so i included it, but nothing changed, still have only wrong byte from qt which is different.

    Tried to replace with QByteArray, but ofcourse it not working. Because i need somehow to use proper one: https://en.cppreference.com/w/cpp/types/byte

    K jsulmJ J.HilkJ 3 Replies Last reply
    0
    • EngelardE Engelard

      Situation:
      For last 3 hours i tried to figure out whats wrong with my code which i successfully ported in Qt. Now i find reason - qt betrayed me.

      I brought my code from VS to Qt. I runned it, everything seems fine,no errors in compile/runtime but program did'nt succeed. Then for next 3 hours i was looking where i made a mistake and found it.

      In vs i had

      using namespace std;
      

      for nicer code. But in Qt i forgot about that. So, as i understand Qt have it's own, embedded 'byte' type. And when i tried add prefix to my code like 'std::byte' compiler tells me "byte is not part of standard library".

      Wut? And then i goes to description of type, found that this type comes from <cstddef> so i included it, but nothing changed, still have only wrong byte from qt which is different.

      Tried to replace with QByteArray, but ofcourse it not working. Because i need somehow to use proper one: https://en.cppreference.com/w/cpp/types/byte

      K Offline
      K Offline
      kenchan
      wrote on last edited by kenchan
      #2

      @Engelard
      As far as I recall whether or not you have an std::byte type is dependent on your system and nothing to do with Qt.
      It just may or may not be defined in your machines standard library.
      BTW std::byte is a C++17 thing.

      1 Reply Last reply
      6
      • EngelardE Engelard

        Situation:
        For last 3 hours i tried to figure out whats wrong with my code which i successfully ported in Qt. Now i find reason - qt betrayed me.

        I brought my code from VS to Qt. I runned it, everything seems fine,no errors in compile/runtime but program did'nt succeed. Then for next 3 hours i was looking where i made a mistake and found it.

        In vs i had

        using namespace std;
        

        for nicer code. But in Qt i forgot about that. So, as i understand Qt have it's own, embedded 'byte' type. And when i tried add prefix to my code like 'std::byte' compiler tells me "byte is not part of standard library".

        Wut? And then i goes to description of type, found that this type comes from <cstddef> so i included it, but nothing changed, still have only wrong byte from qt which is different.

        Tried to replace with QByteArray, but ofcourse it not working. Because i need somehow to use proper one: https://en.cppreference.com/w/cpp/types/byte

        jsulmJ Offline
        jsulmJ Offline
        jsulm
        Lifetime Qt Champion
        wrote on last edited by
        #3

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

        qt betrayed me

        Sorry, but before complaining about Qt you should check what std::byte actually is.
        As @kenchan said std::byte is part of C++ standard library (as everything in std namespace).
        Furthermore std::byte is part of C++17 standard, that means: you need a C++ compiler supporting C++17.
        See https://en.cppreference.com/w/cpp/types/byte
        What compiler do you use?
        This problem is completely unrelated to Qt.

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

        EngelardE 2 Replies Last reply
        8
        • EngelardE Engelard

          Situation:
          For last 3 hours i tried to figure out whats wrong with my code which i successfully ported in Qt. Now i find reason - qt betrayed me.

          I brought my code from VS to Qt. I runned it, everything seems fine,no errors in compile/runtime but program did'nt succeed. Then for next 3 hours i was looking where i made a mistake and found it.

          In vs i had

          using namespace std;
          

          for nicer code. But in Qt i forgot about that. So, as i understand Qt have it's own, embedded 'byte' type. And when i tried add prefix to my code like 'std::byte' compiler tells me "byte is not part of standard library".

          Wut? And then i goes to description of type, found that this type comes from <cstddef> so i included it, but nothing changed, still have only wrong byte from qt which is different.

          Tried to replace with QByteArray, but ofcourse it not working. Because i need somehow to use proper one: https://en.cppreference.com/w/cpp/types/byte

          J.HilkJ Offline
          J.HilkJ Offline
          J.Hilk
          Moderators
          wrote on last edited by
          #4

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

          In vs i had

          using namespace std;
          

          for nicer code. But in Qt i forgot about that.

          And thats one of the reasons I don't use using namespace at least globaly for a class, one should always be certain what one is actually referencing/using

          That makes me also a non user of auto, if I can avoid it.


          Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


          Q: What's that?
          A: It's blue light.
          Q: What does it do?
          A: It turns blue.

          jsulmJ 1 Reply Last reply
          6
          • jsulmJ jsulm

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

            qt betrayed me

            Sorry, but before complaining about Qt you should check what std::byte actually is.
            As @kenchan said std::byte is part of C++ standard library (as everything in std namespace).
            Furthermore std::byte is part of C++17 standard, that means: you need a C++ compiler supporting C++17.
            See https://en.cppreference.com/w/cpp/types/byte
            What compiler do you use?
            This problem is completely unrelated to Qt.

            EngelardE Offline
            EngelardE Offline
            Engelard
            wrote on last edited by Engelard
            #5

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

            This problem is completely unrelated to Qt.

            It works in VS, and not working in Qt. And you telling me that "completely unrelated"? How your argument should work?

            1 Reply Last reply
            0
            • JohanSoloJ Offline
              JohanSoloJ Offline
              JohanSolo
              wrote on last edited by
              #6

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

              It works in VS, and not working in Qt. And you telling me that "completely unrelated"? How your argument should work?

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

              `They did not know it was impossible, so they did it.'
              -- Mark Twain

              EngelardE 1 Reply Last reply
              4
              • jsulmJ jsulm

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

                qt betrayed me

                Sorry, but before complaining about Qt you should check what std::byte actually is.
                As @kenchan said std::byte is part of C++ standard library (as everything in std namespace).
                Furthermore std::byte is part of C++17 standard, that means: you need a C++ compiler supporting C++17.
                See https://en.cppreference.com/w/cpp/types/byte
                What compiler do you use?
                This problem is completely unrelated to Qt.

                EngelardE Offline
                EngelardE Offline
                Engelard
                wrote on last edited by
                #7

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

                What compiler do you use?

                alt text

                1 Reply Last reply
                0
                • JohanSoloJ JohanSolo

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

                  It works in VS, and not working in Qt. And you telling me that "completely unrelated"? How your argument should work?

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

                  EngelardE Offline
                  EngelardE Offline
                  Engelard
                  wrote on last edited by
                  #8

                  @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 1 Reply Last reply
                  0
                  • 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 Offline
                                      jsulmJ Offline
                                      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

                                          • Login

                                          • Login or register to search.
                                          • First post
                                            Last post
                                          0
                                          • Categories
                                          • Recent
                                          • Tags
                                          • Popular
                                          • Users
                                          • Groups
                                          • Search
                                          • Get Qt Extensions
                                          • Unsolved