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Warning! This version of documentation is OUTDATED, as it describes an older SDK version! Please switch to the documentation for the latest SDK version.
Warning! This version of documentation describes an old SDK version which is no longer supported! Please upgrade to the latest SDK version.

Unigine.Expression Class

This class allows you to execute a given code fragment at run-time. There can be up to 4 arguments of any type passed to the Expression. The setVariable() function sets values of such arguments. For example:

Source code (C#)
Expression e0 = new Expression(Engine.get().getWorldInterpreter(), "133.0 * 133.0");
if (e0.isCompiled() == 1)
{
    Log.Message("{0}\n", e0.run().getFloat());
}

Expression e1 = new Expression(Engine.get().getWorldInterpreter(), @"
	{
    int a,b,c,d;
    return a + b + c + d;
	}
");

e1.setVariable("a", new Variable(1));
e1.setVariable("b", new Variable(2));
e1.setVariable("c", new Variable(3));
e1.setVariable("d", new Variable(4));

if(e1.isCompiled() == 1) {
	Log.Message("{0}\n",e1.run().getInt());
}

Expression e2 = new Expression(Engine.get().getWorldInterpreter(), @"
	{

        string name;
		File file = new File(name," + "\"rb\"" + @");

		int size = file.getSize();
		file.close();
		delete file;
		return size;
	}
");

e2.setVariable("name", new Variable("test.cpp"));
if(e2.isCompiled() == 1) {
		Log.Message("{0}\n", e2.run().getInt());
}

Output
double: 17689
int: 10
int: 1302

Expression Class

Members


Expression ( IntPtr interpreter, string src, int scope = 0 ) #

Arguments

  • IntPtr interpreter - Interpreter pointer.
  • string src - Source buffer. Source buffer is a string containing expression's source code.
  • int scope - 1 to treat the expression namespace as the global; otherwise, 0 (by default).

variable run ( ) #

Runs the given expression.

Return value

Argument value.

int saveState ( Stream stream ) #

Saves the expression data (all its parameters) to the specified binary stream.

Arguments

  • Stream stream - Stream to which the expression data will be saved.

Return value

1 if the expression data is saved successfully; otherwise, 0.

int restoreState ( Stream stream ) #

Restores the data of the expression (all its parameters) from the specified binary stream.

Arguments

  • Stream stream - Stream in which the saved expression data is stored.

Return value

1 if the expression data is restored successfully; otherwise, 0.
Last update: 2020-04-10
Build: ()