LSPModeler Class¶

Summary¶

Functions¶

LSPModeler::LSPModeler()¶

Constructs a complete modeler environment.

See:	localsolver::LocalSolver

LSPModeler::~LSPModeler()¶

Deletes this modeler environment and all associated objects. This also includes solvers created using the LSPModeler::createSolver() method.

LocalSolver LSPModeler::createSolver()¶

Returns a new LocalSolver instance that can be used to launch a module with the method LSPModule::run().

Returns:	Solver.
See:	localsolver::LocalSolver

LSPModule LSPModeler::loadModule(const std::string &file)¶

Loads a program written in LSP format into an LSPModule whose name corresponds to the provided filename (without path and .lsp extension). The variables of the module can be manipulated through the associated LSPModule object.

Parameters:	file – Path to the file.
Returns:	Module created.
See:	LSPModule

LSPModule LSPModeler::createModule(const std::string &moduleName)¶

Creates an empty module with the given name. The variables of the module can then be manipulated through the associated LSPModule object.

Parameters:	moduleName – Module name.
Returns:	Module created.
See:	LSPModule

LSPModule LSPModeler::getModule(const std::string &moduleName)¶

Returns the loaded module with the given name. User loaded modules can be accessed as well as builtin modules like the JSON module or the CSV module:

LSPModule jsonModule = modeler.getModule("json");

The variables of the module can then be manipulated through the associated LSPModule object.

Parameters:	moduleName – Module name.
Returns:	Module loaded.
See:	LSPModule

LSPFunction LSPModeler::createFunction(LSPFunctor *functor)¶

Creates an external LSPFunction. The argument must be derived from LSPFunctor. When the function is called, the modeler instance will be made accessible to the function, as well as the arguments.

For instance, the following example creates a simple function that accepts two arguments and returns the sum of both values. The generated function is then exposed in an LSP module under the name “myCustomFunction”:

class MyCustomFunction : public LSPFunctor {
    LSPValue call(LSPModeler& modeler, const LSPValue* args, int nbArgs) override {
        return modeler.createDouble(arguments[0].asDouble() + arguments[1].asDouble());
    }
};

MyCustomFunction customFunctor;
module.setFunction("myCustomFunction", modeler.createFunction(&customFunctor));

Note: This method should only be used to expose functions used during the modeling process. You should not use this method to create a function that will be used during the resolution as anexternal function. In this case, you should instead use the solver API directly (see localsolver::LSExternalFunction)

Parameters:	functor – Implementation of the external function.
Returns:	Function created.
See:	LSPFunctor
See:	LSPFunction

LSPFunction LSPModeler::createFunction(const std::string &name, LSPFunctor *functor)¶

Creates an external LSPFunction. The argument must be derived from LSPFunctor. When the function is called, the modeler instance will be made accessible to the function, as well as the arguments.

For instance, the following example creates a simple function that accepts two arguments and returns the sum of both values. The generated function is then exposed in an LSP module under the name “myCustomFunction”:

class MyCustomFunction : public LSPFunctor {
    LSPValue call(LSPModeler& modeler, const LSPValue* arguments, int nbArguments) override {
        return modeler.createDouble(arguments[0].asDouble() + arguments[1].asDouble());
    }
};

MyCustomFunction customFunctor;
module.setFunction("myCustomFunction", modeler.createFunction("myCustomFunction", &customFunctor));

Note: This method should only be used to expose functions used during the modeling process. You should not use this method to create a function that will be used during the resolution as an external function. In this case, you should instead use the solver API directly (see localsolver::LSExternalFunction)

Parameters:	name – Name of the function. The name is only used to identify the function in the generated stack trace when an exception occurs. Once created, the function can be associated with any variable in any module, regardless of its name. functor – Implementation of the external function.
Returns:	Function created.
See:	LSPFunctor
See:	LSPFunction

LSPMap LSPModeler::createMap()¶

Creates an LSPMap. A map is a data structure mapping keys to values that can also be used as an array-like structure. Keys and values can be of any type except nil. The map can be assigned to any variable in a module with LSPModule::setMap() or can be part of another map with LSPMap::setMap().

Returns:	Map created.
See:	LSPMap

LSPValue LSPModeler::createNil()¶

Creates a nil value.

Returns:	Created nil value.
See:	LSPValue

LSPValue LSPModeler::createInt(lsint value)¶

Creates an integer value. The value can be assigned to any variable in a module with LSPModule::setValue() or can be part of a map as key or value.

Returns:	Created integer value.
See:	LSPValue

LSPValue LSPModeler::createDouble(lsdouble value)¶

Creates a double value. The value can be assigned to any variable in a module with LSPModule::setValue() or can be part of a map as key or value.

Returns:	Created double value.
See:	LSPValue

LSPValue LSPModeler::createBool(bool value)¶

Creates a boolean value. Please note that there is no dedicated type for booleans in the modeler. They are simulated with integers: 1 denotes true and 0 denotes false. The created value can be assigned to any variable in a module with LSPModule::setValue() or can be part of a map as key or value.

Returns:	Created boolean value.
See:	LSPValue

LSPValue LSPModeler::createString(const std::string &value)¶

Creates a string value. The value can be assigned to any variable in a module with LSPModule::setValue() or can be part of a map as key or value.

Returns:	Created string value.
See:	LSPValue