...数组<对象 ^>^ args
我正在阅读 C++/CLI。我看到这个东西：
Object^ CreateInstanceFromTypename(String^ type, ...array<Object^>^ args)
{
if (!type)
throw gcnew ArgumentNullException("type");
Type^ t = Type::GetType(type);
if (!t)
throw gcnew ArgumentException("Invalid type name");
Object^ obj = Activator::CreateInstance(t, args);
return obj;
}
调用它时：
Object^ o = CreateInstanceFromTypename(
"System.Uri, System, Version=2.0.0.0, "
"Culture=neutral, PublicKeyToken=b77a5c561934e089",
"http://www.heege.net"
);
What is ...array^ args?如果我删除 ... ，则会出现编译错误：
error C2665: 'CreateInstanceFromTypeName' : none of the 2 overloads could convert all the argument types
1> .\myFourthCPlus.cpp(12): could be 'System::Object ^CreateInstanceFromTypeName(System::String ^,cli::array<Type> ^)'
1> with
1> [
1> Type=System::Object ^
1> ]
1> while trying to match the argument list '(const char [86], const char [21])'
I'm reading C++/CLI. I see this stuff:
Object^ CreateInstanceFromTypename(String^ type, ...array<Object^>^ args)
{
if (!type)
throw gcnew ArgumentNullException("type");
Type^ t = Type::GetType(type);
if (!t)
throw gcnew ArgumentException("Invalid type name");
Object^ obj = Activator::CreateInstance(t, args);
return obj;
}
When calling it:
Object^ o = CreateInstanceFromTypename(
"System.Uri, System, Version=2.0.0.0, "
"Culture=neutral, PublicKeyToken=b77a5c561934e089",
"http://www.heege.net"
);
What is ...array^ args? If I remove ... ,there's a complied-error:
error C2665: 'CreateInstanceFromTypeName' : none of the 2 overloads could convert all the argument types
1> .\myFourthCPlus.cpp(12): could be 'System::Object ^CreateInstanceFromTypeName(System::String ^,cli::array<Type> ^)'
1> with
1> [
1> Type=System::Object ^
1> ]
1> while trying to match the argument list '(const char [86], const char [21])'
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与 C++ 一样，C++/CLI 具有可变数量参数的机制。这就是
...array参数前面的...的含义。为了类型安全，C++/CLI 设计者添加了托管语法来声明变量数组的类型。
由于它只是将该参数传递给 Activator::CreateInstance() 函数，因此我将查看 Activator 函数正在寻找哪些变量参数。
Like C++, C++/CLI has a mechanism for a variable amount of arguments. That is what the
...in front of the...array<Object^>^parameter means.For type safety the C++/CLI designers added managed syntax to declare the type of the variable array.
Since it's just passing that parameter to the
Activator::CreateInstance()function, I would look at what variable parameters the Activator function is looking for.