如何将 class 方法转换为 QScriptEngine::FunctionSignature

Question

我想通过这个方法：

QScriptValue ScriptProcessContext::construct(QScriptContext * ctx, QScriptEngine *)
{
    return this->newInstance();
}

到QScriptEngine::newFunction。我尝试了以下选项：

如文档中所述and also this example code:

QScriptValue ctor = engine->newFunction(construct);

错误：

error C3867: 'ScriptProcessContext::construct': function call missing argument list; use '&ScriptProcessContext::construct' to create a pointer to member

强制转换：

QScriptValue ctor = engine->newFunction((QScriptEngine::FunctionSignature)construct);

错误：

error C2440: 'type cast' : cannot convert from 'overloaded-function' to 'QScriptEngine::FunctionSignature'

将指针转换为成员

QScriptValue ctor = engine->newFunction(
   (QScriptValue(ScriptProcessContext::*)(QScriptContext *, QScriptEngine *))
    &ScriptProcessContext::construct
);

错误：

 error C2664: 'QScriptValue QScriptEngine::newFunction(QScriptEngine::FunctionSignature,int)' : cannot convert parameter 1 from 'QScriptValue (__cdecl ScriptProcessContext::* )(QScriptContext *,QScriptEngine *)' to 'QScriptEngine::FunctionSignature'

那么怎么写才是正确的呢？

Answer 1

您尝试传递一个成员函数。那是不支持的。使用自由函数或静态方法。

请注意，在这两种情况下，您都不会有 this 指针。您需要以不需要对象的方式编写函数。

如何将 class 方法转换为 QScriptEngine::FunctionSignature

How do I cast class method to QScriptEngine::FunctionSignature

c++

qt

function-pointers

qtscript

pointer-to-member