initial skeleton

.gitattributes

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+# Auto detect text files and perform LF normalization
+* text=auto

.github/workflows/ci.yml

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+name: ci
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build
+        run: mkdir build && ../cbuild

.gitignore

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+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Bb]uild/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
+*.pdb
+*.pgc
+*.pgd
+*.rsp
+*.sbr
+*.tlb
+*.tli
+*.tlh
+*.tmp
+*.tmp_proj
+*.log
+*.vspscc
+*.vssscc
+.builds
+*.pidb
+*.svclog
+*.scc
+
+# Chutzpah Test files
+_Chutzpah*
+
+# Visual C++ cache files
+ipch/
+*.aps
+*.ncb
+*.opendb
+*.opensdf
+*.sdf
+*.cachefile
+
+# Visual Studio profiler
+*.psess
+*.vsp
+*.vspx
+*.sap
+
+# TFS 2012 Local Workspace
+$tf/
+
+# Guidance Automation Toolkit
+*.gpState
+
+# ReSharper is a .NET coding add-in
+_ReSharper*/
+*.[Rr]e[Ss]harper
+*.DotSettings.user
+
+# JustCode is a .NET coding add-in
+.JustCode
+
+# TeamCity is a build add-in
+_TeamCity*
+
+# DotCover is a Code Coverage Tool
+*.dotCover
+
+# NCrunch
+_NCrunch_*
+.*crunch*.local.xml
+nCrunchTemp_*
+
+# MightyMoose
+*.mm.*
+AutoTest.Net/
+
+# Web workbench (sass)
+.sass-cache/
+
+# Installshield output folder
+[Ee]xpress/
+
+# DocProject is a documentation generator add-in
+DocProject/buildhelp/
+DocProject/Help/*.HxT
+DocProject/Help/*.HxC
+DocProject/Help/*.hhc
+DocProject/Help/*.hhk
+DocProject/Help/*.hhp
+DocProject/Help/Html2
+DocProject/Help/html
+
+# Click-Once directory
+publish/
+
+# Publish Web Output
+*.[Pp]ublish.xml
+*.azurePubxml
+# TODO: Comment the next line if you want to checkin your web deploy settings 
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
+*.build.csdef
+
+# Microsoft Azure Emulator
+ecf/
+rcf/
+
+# Windows Store app package directories and files
+AppPackages/
+BundleArtifacts/
+Package.StoreAssociation.xml
+_pkginfo.txt
+
+# Visual Studio cache files
+# files ending in .cache can be ignored
+*.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
+ClientBin/
+~$*
+*~
+*.dbmdl
+*.dbproj.schemaview
+*.pfx
+*.publishsettings
+node_modules/
+orleans.codegen.cs
+
+# Since there are multiple workflows, uncomment next line to ignore bower_components 
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
+
+# RIA/Silverlight projects
+Generated_Code/
+
+# Backup & report files from converting an old project file
+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
+_UpgradeReport_Files/
+Backup*/
+UpgradeLog*.XML
+UpgradeLog*.htm
+
+# SQL Server files
+*.mdf
+*.ldf
+
+# Business Intelligence projects
+*.rdl.data
+*.bim.layout
+*.bim_*.settings
+
+# Microsoft Fakes
+FakesAssemblies/
+
+# GhostDoc plugin setting file
+*.GhostDoc.xml
+
+# Node.js Tools for Visual Studio
+.ntvs_analysis.dat
+
+# Visual Studio 6 build log
+*.plg
+
+# Visual Studio 6 workspace options file
+*.opt
+
+# Visual Studio LightSwitch build output
+**/*.HTMLClient/GeneratedArtifacts
+**/*.DesktopClient/GeneratedArtifacts
+**/*.DesktopClient/ModelManifest.xml
+**/*.Server/GeneratedArtifacts
+**/*.Server/ModelManifest.xml
+_Pvt_Extensions
+
+# Paket dependency manager
+.paket/paket.exe
+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml

CMakeLists.txt

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+# CMakeList.txt : CMake project for ImageMan, include source and define
+# project specific logic here.
+#
+cmake_minimum_required(VERSION 3.19)
+
+if(${CMAKE_VERSION} VERSION_LESS 3.19)
+    cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
+endif()
+
+include(FetchContent)
+
+project(cppScratch 
+    VERSION 
+        1.0 
+    DESCRIPTION 
+        "C++ scratchpad" 
+    LANGUAGES 
+        CXX)
+    
+# set(CMAKE_CXX_STANDARD 17)
+
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}) 
+
+add_subdirectory(libs/library)
+add_subdirectory(libs/dal)
+add_subdirectory(src)

README.md

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+# cppScratch
+ Testing c++

cbuild

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+cmake .. -DCMAKE_BUILD_TYPE=Debug
+cmake --build .

include/cppScratch/dal/dal.hpp

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+// ImageMan.h : Include file for standard system include files,
+// or project specific include files.
+
+#pragma once
+
+#include <iostream>
+#include <pqxx/pqxx>
+
+void dal_func();
+
+// TODO: Reference additional headers your program requires here.

include/cppScratch/test.hpp

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+// ImageMan.h : Include file for standard system include files,
+// or project specific include files.
+
+#pragma once
+
+#include <iostream>
+#include <fstream>
+// #include <nlohmann/json.hpp>
+
+void example_func();
+
+// TODO: Reference additional headers your program requires here.

libs/dal/CMakeLists.txt

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+set(LIB_NAME "dal")
+
+add_library(${LIB_NAME} src/lib.cpp src/secret.cpp)
+
+FetchContent_Declare(
+    libpqxx
+  GIT_REPOSITORY https://github.com/jtv/libpqxx.git
+  GIT_TAG        7.7.5
+)
+
+FetchContent_MakeAvailable(libpqxx)
+
+# We need this directory, and users of our library will need it too
+target_include_directories(${LIB_NAME} PUBLIC ../../include PRIVATE ./include)
+target_link_libraries(${LIB_NAME} PUBLIC pqxx)
+
+# All users of this library will need at least C++11
+target_compile_features(${LIB_NAME} PUBLIC cxx_std_17)
+
+# IDEs should put the headers in a nice place
+source_group(
+  TREE "${PROJECT_SOURCE_DIR}/include"
+  PREFIX "Header Files"
+  FILES ${HEADER_LIST})

libs/dal/include/dal/secret.hpp

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+#pragma once
+
+#include <iostream>
+
+void dal_secret();

libs/dal/src/lib.cpp

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+#include "cppScratch/dal/dal.hpp"
+#include "dal/secret.hpp"
+
+using namespace std;
+
+void dal_func() {
+    cout << "hello from dal" << endl;
+    dal_secret();
+
+    try
+    {
+        // Connect to the database.  You can have multiple connections open
+        // at the same time, even to the same database.
+        pqxx::connection c;
+        std::cout << "Connected to " << c.dbname() << '\n';
+
+        // Start a transaction.  A connection can only have one transaction
+        // open at the same time, but after you finish a transaction, you
+        // can start a new one on the same connection.
+        pqxx::work tx{c};
+
+        // Query data of two columns, converting them to std::string and
+        // int respectively.  Iterate the rows.
+        for (auto [name, salary] : tx.query<std::string, int>(
+            "SELECT name, salary FROM employee ORDER BY name"))
+        {
+            std::cout << name << " earns " << salary << ".\n";
+        }
+
+        // For large amounts of data, "streaming" the results is more
+        // efficient.  It does not work for all types of queries though.
+        //
+        // You can read fields as std::string_view here, which is not
+        // something you can do in most places.  A string_view becomes
+        // meaningless when the underlying string ceases to exist.  In this
+        // one situation, you can convert a field to string_view and it
+        // will be valid for just that one iteration of the loop.  The next
+        // iteration may overwrite or deallocate its buffer space.
+        for (auto [name, salary] : tx.stream<std::string_view, int>(
+            "SELECT name, salary FROM employee"))
+        {
+            std::cout << name << " earns " << salary << ".\n";
+        }
+
+        // Execute a statement, and check that it returns 0 rows of data.
+        // This will throw pqxx::unexpected_rows if the query returns rows.
+        std::cout << "Doubling all employees' salaries...\n";
+        tx.exec0("UPDATE employee SET salary = salary*2");
+
+        // Shorthand: conveniently query a single value from the database.
+        int my_salary = tx.query_value<int>(
+            "SELECT salary FROM employee WHERE name = 'Me'");
+        std::cout << "I now earn " << my_salary << ".\n";
+
+        // Or, query one whole row.  This function will throw an exception
+        // unless the result contains exactly 1 row.
+        auto [top_name, top_salary] = tx.query1<std::string, int>(
+            R"(
+                SELECT name, salary
+                FROM employee
+                WHERE salary = max(salary)
+                LIMIT 1
+            )");
+        std::cout << "Top earner is " << top_name << " with a salary of "
+                    << top_salary << ".\n";
+
+        // If you need to access the result metadata, not just the actual
+        // field values, use the "exec" functions.  Most of them return
+        // pqxx::result objects.
+        pqxx::result res = tx.exec("SELECT * FROM employee");
+        std::cout << "Columns:\n";
+        for (pqxx::row_size_type col = 0; col < res.columns(); ++col)
+            std::cout << res.column_name(col) << '\n';
+
+        // Commit the transaction.  If you don't do this, the database will
+        // undo any changes you made in the transaction.
+        std::cout << "Making changes definite: ";
+        tx.commit();
+        std::cout << "OK.\n";
+    }
+    catch (std::exception const &e)
+    {
+        std::cerr << "ERROR: " << e.what() << '\n';
+    }
+}

libs/dal/src/secret.cpp

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+#include "dal/secret.hpp"
+
+using namespace std;
+
+void dal_secret() 
+{
+    cout << "secret shhh" << endl;
+}

libs/library/CMakeLists.txt

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+set(LIB_NAME "library")
+
+add_library(${LIB_NAME} src/lib.cpp)
+
+# We need this directory, and users of our library will need it too
+target_include_directories(${LIB_NAME} PUBLIC ../../include PRIVATE ./include)
+
+# All users of this library will need at least C++11
+target_compile_features(${LIB_NAME} PUBLIC cxx_std_17)
+
+# IDEs should put the headers in a nice place
+source_group(
+  TREE "${PROJECT_SOURCE_DIR}/include"
+  PREFIX "Header Files"
+  FILES ${HEADER_LIST})

libs/library/include/library/lib.hpp

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+#pragma once
+
+#include <iostream>

libs/library/src/lib.cpp

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+#include "cppScratch/test.hpp"
+#include "library/lib.hpp"
+
+using namespace std;
+
+void example_func() {
+    cout << "hello from a func" << endl;
+}

src/CMakeLists.txt

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+add_executable(cppScratch main.cpp)
+
+FetchContent_Declare(
+    json
+  GIT_REPOSITORY https://github.com/nlohmann/json.git
+  GIT_TAG        v3.11.2
+)
+
+FetchContent_MakeAvailable(json)
+
+target_link_libraries(cppScratch PRIVATE nlohmann_json::nlohmann_json dal library)

src/main.cpp

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+#include "cppScratch/test.hpp"
+#include "cppScratch/dal/dal.hpp"
+
+using namespace std;
+
+int main(void) {
+    cout << "hello world" << endl;
+    dal_func();
+    example_func();
+}