palebedev / cosec-examples

Examples for COSEC students

Examples for COSEC students

It is assumed you have made yourself familiar with ntc-cmake, what it automates and how, please start there (see dependencies below for the link).

• Serialization:
  • schema-serial: usage of Flatbuffers as a serialization library with external schema specification and code generator.
  • interprocess-copy: benchmark of various interprocess data copy implementations.
• Asynchrony:
  • thread-pool: simple thread pool and executor usage.
  • asio-basic: basic asynchronous tcp server with logging and error handling.
  • asio-advanced: multi-threaded tcp server with continuations that has operation limits.
  • asio-stackfull-coro: tcp server that uses stackfull coroutines based on Boost.Context.
  • asio-shared: server with shared state which uses strands for synchronization.
  • atomic: a small example on atomic usage.
  • select: server that implements basic asynchronous primitives using select reactor.
  • generator: synchronous generator based on C++20 coroutines.
• Assembler:
  • asm-basic: basic usage of inline assembly and assembler modules.
  • anf: usage of SSE intrinsic functions.
• Qt:
  • layouts-painting: basic use signals/slots, Qt Designer, layouts and mouse/paint events for custom-looking widgets.
  • item-models: usage of Qt Item Models and Views/Widgets.
  • block-scene: usage of QGraphicsScene, items and views.
  • gui-progress: offloading lengthy tasks to a non-gui QThread and communicating with it using queued signals/slots.
  • locale-resources: usage of resources and translations in Qt.
  • geohash: qtpositioning + simple use of QNetworkAccessManager from qtnetwork.
  • delegates-sql: use of queries and item models with qtsql and custom item delegates.
  • treeview: tree view item model example.
• Miscellaneous:
  • et: use of expression templates to optimize evaluation of expressions.

Dependencies:

• C++ compiler and standard library with sufficient support for C++20.
• >=ntc-cmake-1.1.0 - see https://github.com/palebedev/ntc-cmake
• >=Boost-1.74.0
• >=Qt-5.15 (LinguistTools,Network,Positioning,Sql,Svg,WebEngineWidgets modules and their dependencies)
• >=google-benchmark-1.5.0
• >=FlatBuffers-1.12.0

cosec-examples's Issues

Build broken in schema-serial

Auto-generated flatbuffers headers cannot be found from main.cpp. Tried the following ways to fix (and no result):

• Specify PRE_BUILD option in add_custom_command (this should not have any impact but why not)
• Call ninja command with -j1 option (thought that parallel build might be the reason)
• Use add_custom_target instead of add_custom_command and then call add_dependencies (I know that add_custom_command is preferable because it is called only when needed, just tried to investigate)
• Include this header with "" instead of <>
• Move ntc_target(schema-serial) before flat_buffers_autogen(schema-serial) (thought that ntc_target call might overwrite some needed options)

The most interesting thing is that this header IS actually generated and placed inside include subdirectory in the build directory.

One more thing: I managed to build the project successfully several times, but I can't describe how to reproduce it. It was just like "changed something in the corresponding CMakeLists.txt, and it built successfully". However, after deleting the build directory the "clear" build fails.

Can it be a bug in CMake? Can't find a way to make the code work correctly (and it actually should work correctly, but does not). I use: CMake 3.19.2, ninja 1.10.2, gcc 10.2.0.

[33/89] Building CXX object schema-serial/CMakeFiles/schema-serial.dir/src/main.cpp.o
FAILED: schema-serial/CMakeFiles/schema-serial.dir/src/main.cpp.o
/usr/sbin/c++ -DBOOST_ALL_DYN_LINK -DBOOST_ALL_NO_LIB -DBOOST_ASIO_NO_DEPRECATED -DBOOST_ASIO_NO_TS_EXECUTORS -DBOOST_ATOMIC_DYN_LINK -DBOOST_CHRONO_DYN_LINK -DBOOST_FILESYSTEM_DYN_LINK -DBOOST_LOG_DYN_LINK -DBOOST_REGEX_DYN_LINK -DBOOST_SYSTEM_DYN_LINK -DBOOST_THREAD_DYN_LINK -I../utils/include -isystem utils/include -g -pedantic-errors -fno-math-errno -fno-signed-zeros -fno-trapping-math -Wall -Wextra -Wcast-align -Wconversion -Wctor-dtor-privacy -Wdeprecated -Wdouble-promotion -Wduplicated-branches -Wduplicated-cond -Wextra-semi -Wimplicit-fallthrough -Wlogical-op -Wmissing-declarations -Wno-assume -Wno-missing-field-initializers -Wnull-dereference -Wold-style-cast -Wpragmas -Wredundant-decls -Wundef -Wzero-as-null-pointer-constant -ftemplate-backtrace-limit=0 -fdiagnostics-show-template-tree -gsplit-dwarf -std=c++2a -MD -MT schema-serial/CMakeFiles/schema-serial.dir/src/main.cpp.o -MF schema-serial/CMakeFiles/schema-serial.dir/src/main.cpp.o.d -o schema-serial/CMakeFiles/schema-serial.dir/src/main.cpp.o -c ../schema-serial/src/main.cpp
../schema-serial/src/main.cpp:1:10: fatal error: widget_generated.h: No such file or directory
    1 | #include <widget_generated.h>
      |          ^~~~~~~~~~~~~~~~~~~~
compilation terminated.