QT自带的数学表达式计算QScriptEngine

QT自带的有一个数学表达式计算类 QScriptEngine

不用自己搞什么算法。

#include <QScriptEngine>

QT += script

QScriptEngine myEngine;

QScriptValue three = myEngine.evaluate("1 + 2");

QScriptValue fun = myEngine.evaluate("(function(a, b)  { return a + b; })");

QScriptValueList args; args << 1 << 2;

QScriptValue threeAgain = fun.call(QScriptValue(), args);