Converting from older code for GooFit 2.0

Build system

The build system underwent a major upgrade in the move to CMake. You should remove your old Makefiles and use the new CMakeFiles.txt files provided in examples - this should require writing two lines of code instead of the 50 or so previously needed.

An example of a CMakeLists.txt file:

# Add links to all the data and source files in this directory
goofit_add_directory()

# Add an explicit link if you prefer finer control
goofit_add_link("myfile.txt")

# Add a GooFit program
goofit_add_executible(MyNewExample MyNewExample.cu)

# Add a GooFit PDF
include_directory(.)
goofit_add_pdf(MyPdf.cu MyPdf.h)

Renames and moves

The folders that were introduced to keep the includes structured require modifications of source code, converting lines like #include "Variable.hh" to #include "goofit/Variable.h". This modification can be done for you by running the provided script, scripts/ModernizeGooFit.py on your source files (requires Python and Plumbum). For example:

./scripts/ModernizeGooFit.py goofit_mypackage/*.cu

Application

The new GooFit::Application, which is not required but provides GooFit options, like GPU selection and status, as well as MPI support and configurable command line options, is available by adding:

#include "goofit/Application.h"

// Place this at the beginning of main
GooFit::Application app{"Optional description", argc, argv};

// Command line options can be added here.

try {
    app.run();
} catch(const GooFit::ParseError &e) {
    return app.exit(e);
}

See CLI11 for more details. The pipipi0 example has an example of a complex set of options.

Variable

The Variable class no longer allows direct access to members: please use getters and setters. For convenience, quick access to the value of a variable is also provided.

Variable var {"var", 1.0, .01, -10, 10};

// Was fptype x = var.value;
fptype x = var.getValue();
fptype x = var; // Shortcut

// Was var.value = x;
var.SetValue(x);
var = x; // Shortcut

// Was istream >> var.value;
fptype x; istream >> x; val.setValue(x);
istream >> var; // Shortcut

The other values do not provide shortcut access. Copying a variable is explicitly disallowed; it was possible before but gave incorrect results.

Namespaces

GooFit no longer leaks the std:: namespace, and all of GooFit is now inside the GooFit namespace. You can add using namespace GooFit; at the top of your code.

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