Hot reloading QT C++ using Live++

Turbocharge your QT C++ development using Live++ hot reloading.

What is hot reloading?

C++ development lifecycle consists of - coding and waiting for the compiler to compile and link. Sometimes, the compiler takes many minutes, sometimes, hours to generate a resultant executable. Precious development time is spent... waiting.

Photocredt: XKCD - Compiling

Before using Hot Reloading, you can avail of the following tips:

Live++ is easy to integrate with your code, and Live++ hot-patching modifies code-changes at run-time, greatly reducing debug and refactoring time.

Immense Time Savings

Adding Live++ is, simply linking to the Live++ SDK, and running the initialization process. When you want to recompile, use the Live++ hotkey - Ctrl+Alt+F11, as it patches the EXE with your updates, while your app is still running!

Whoa. As a development example, you load data from the database, and you update the code to generate report, without restarting the app.


Without using Live++, you would have to constantly reload data from the database, then debug the code to generate the report.

Image a situation where, you update code, and don't have to repeatedly reload data from database to generate the report? That would save lot of time, allow you to resolve bugs immediately.

Photocredit: Terminator 2 clip.

Reduce Build Times

An average build takes 7+ minutes. A full recompile may take 15 minutes.

If there are multiple dependencies, and, work needs to be done in auxiliary projects, Doing a final build could take longer than an hour.

After using Live++, I could go between 3 seconds to 3mins for a hot-reload, instead of a compile every 7-15 minutes. This immense time-saving means I can do work faster.

    lpp::LppDefaultAgent lppAgent = lpp::LppCreateDefaultAgent(nullptr, L"(Folder)");
    // bail out in case the agent is not valid
    if (!lpp::LppIsValidDefaultAgent(&lppAgent))
    {
        return 1;
    }
    // enable Live++ for all loaded modules
    lppAgent.EnableModule(lpp::LppGetCurrentModulePath(), lpp::LPP_MODULES_OPTION_NONE, nullptr, nullptr);

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