在C ++中动态声明数据类型 [英] Declaring a data type dynamically in C++

问题描述

我希望能够执行以下操作：

I want to be able to do the following:

我有一个包含数据类型的字符串数组：

I have an array of strings that contain data types:

string DataTypeValues[20] = {"char", "unsigned char", "short", "int"};

然后，我想在运行时创建一种数据类型的变量。我不会在编译时知道正确的数据类型。

Then later, I would like to create a variable of one of the data types at runtime. I won't know at compile time what the correct data type should be.

因此，例如，如果在运行时我确定变量x需要为int类型：

So for example, if at runtime I determined a variable x needed to be of type int:

DataTypeValues[3] x = 100;

显然这行不通，那么我该怎么做？

Obviously this won't work, so how could I do something like this?

推荐答案

简单的答案是您不能-在C ++中需要在编译时知道类型。您可以使用boost :: any或union来执行类似的操作，但是效果并不理想。

The simple answer is that you can't - types need to be known at compile time in C++. You can do something like it using things like boost::any or unions, but it won't be pretty.

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