C++ custom debugger view for VisualCode

you can add custom view  for debugger.

https://www.cppstories.com/2021/natvis-tutorial/

https://devblogs.microsoft.com/cppblog/debug-visualizers-in-visual-c-2015/

create into your root folder  xxx.natvis

make sure in the launch.json  to add

            "visualizerFile": "${workspaceFolder}/xxx.natvis",

            "showDisplayString": true,

more sample:

 https://learn.microsoft.com/en-us/visualstudio/debugger/create-custom-views-of-native-objects?view=vs-2019

note:

the Name of the class must be full qualified e.g. contain namespace name if exist.

even typedef name should be act as new Name in the natvis file.

ty  

enjoy

Yaniv 

sample template class:

template<typename T> class MyObject

{

public:

    MyObject() : myVal( 5 ) {}

    T myVal;

};

sample template  natvis file:

<?xml version="1.0" encoding="utf-8"?>

<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">

<Type Name="MyObject&lt;*&gt;">

  <DisplayString>{{myVal = {myVal}}}</DisplayString>

  <Expand>

    <Item Name="[myVal]">myVal</Item>

  </Expand>

</Type> 

</AutoVisualizer>

WhatsApp Messages (Business Cloud API)

 

C++ struct alignment - can save you memory

 the orders of members in a struct affect sizeof of struct 

see this example https://www.joshcaratelli.com/blog/struct-packing

if no compiler directive - memory align to 8 bytes by default

struct top

{

    char* p; //8 bytes

    int i;  //4 bytes

    short s; // 2 bytes

    char c;  // 1 byte

                    // 1 padding 

    int t; // 4 bytes

                    // 4 padding 

};

struct buttom

{

    char c; // 1 bytes -- 7 padding

    char* p; //8 bytes

    short s;  //2 bytes

    int i;   //4 bytes

               // 2 padding

    int t;  // 4 bytes 

               // 4 padding

        

};

    int sizeTop = sizeof(top);   // =>24

    int sizeButtom = sizeof(buttom); // =>32

SQLite - C++ 11

 

code - https://github.com/a4z/sthlm0x06_samplecode/blob/master/sample1.cpp

online sqlite to play with  -> https://www.sqlitetutorial.net/tryit/

some tips about insert speed 

https://stackoverflow.com/questions/1711631/improve-insert-per-second-performance-of-sqlite/

C++ performance - hardware

The Most Important Optimizations to Apply in Your C++ Programs

++

 very impressive guide 

read about 

Profile-guided optimization (PGO)  and WPO  -- its free compiler option that can boost your program.

Online benchmark tool for C++

nice tool for testing 

https://quick-bench.com/

c++ advanced tips

 https://www.geeksforgeeks.org/template-metaprogramming-in-c

https://en.wikipedia.org/wiki/Memoization

Better C++14 reflections - Antony Polukhin

Reading Binary Data with Style: A Serialization Framework for C++17

https://github.com/apolukhin/magic_get

https://github.com/Neargye/magic_enum

https://github.com/neobrain/blobify

Template Normal Programming

https://www.youtube.com/watch?v=vwrXHznaYLA

"Type Deduction and Why You Care"

 https://www.youtube.com/watch?v=wQxj20X-tIU

https://www.linkedin.com/pulse/introduction-c-templates-marcus-tomlinson-/?trk=pulse-article_more-articles_related-content-card

Intro to Template Metaprogramming

https://www.youtube.com/watch?v=VBI6TSo8Zog&list=PLWxziGKTUvQFIsbbFcTZz7jOT4TMGnZBh

Template Metaprogramming: Type Traits

Walter E. Brown "Modern Template Metaprogramming -- good

https://en.wikipedia.org/wiki/Template_metaprogramming

https://en.wikipedia.org/wiki/Curiously_recurring_template_pattern