如何在c ++中使用带有类/结构变量的列表

Question

我有一个正在运行的C#程序，如下所示。我正在尝试将其转换为C++，但在获得所需的输出时遇到问题，尽管下面给出的C++程序中没有编译错误。

我试图转换的C#程序是：

class Evl_token
{
    public enum Token_type { NAME, NUMBER, SINGLE };
    public Token_type type;
    public string str;
    public int line_no;
}; // class evl_token

List<Evl_token> tokens = new List<Evl_token>()
        {
            //input is below 
            //line 1 module top;
            //line 2 wire in,out;
            //line 3 not(out,in);
            //line 4 endmodule

            new Evl_token {line_no = 1, str = "module", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 1, str = "top", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 1, str = ";", type = Evl_token.Token_type.SINGLE},
            new Evl_token {line_no = 2, str = "wire", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 2, str = "in", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 2, str = ",", type = Evl_token.Token_type.SINGLE},
            new Evl_token {line_no = 2, str = "out", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 2, str = ";", type = Evl_token.Token_type.SINGLE},
            new Evl_token {line_no = 3, str = "not", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 3, str = "(", type = Evl_token.Token_type.SINGLE},
            new Evl_token {line_no = 3, str = "out", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 3, str = ",", type = Evl_token.Token_type.SINGLE},
            new Evl_token {line_no = 3, str = "in", type = Evl_token.Token_type.NAME},
            new Evl_token {line_no = 3, str = ")", type = Evl_token.Token_type.SINGLE},
            new Evl_token {line_no = 3, str = ";", type = Evl_token.Token_type.SINGLE},
            new Evl_token {line_no = 4, str = "endmodule", type = Evl_token.Token_type.NAME},
        };

我想出的相应的C++程序如下：

struct evl_token
{
    enum token_type { NAME, NUMBER, SINGLE };
    token_type type;
    std::string str;
    int line_no;
}; //struct evl_token

typedef std::list<evl_token> evl_tokens;

evl_tokens tokens;

evl_token token;

//{
    //input is below 
    //line 1 module top;
    //line 2 wire in,out;
    //line 3 not(out,in);
    //line 4 endmodule
    token.line_no = 1, token.str = "module", token.type = evl_token::NAME,
    token.line_no = 1, token.str = "top", token.type = evl_token::NAME,
    token.line_no = 1, token.str = ";", token.type = evl_token::SINGLE,
    token.line_no = 2, token.str = "wire", token.type = evl_token::NAME,
    token.line_no = 2, token.str = "in", token.type = evl_token::NAME,
    token.line_no = 2, token.str = ",", token.type = evl_token::SINGLE,
    token.line_no = 2, token.str = "out", token.type = evl_token::NAME,
    token.line_no = 2, token.str = ";", token.type = evl_token::SINGLE;
    token.line_no = 3, token.str = "not", token.type = evl_token::NAME,
    token.line_no = 3, token.str = "(", token.type = evl_token::SINGLE,
    token.line_no = 3, token.str = "out", token.type = evl_token::NAME,
    token.line_no = 3, token.str = ",", token.type = evl_token::SINGLE,
    token.line_no = 3, token.str = "in", token.type = evl_token::NAME,
    token.line_no = 3, token.str = ")", token.type = evl_token::SINGLE,
    token.line_no = 3, token.str = ";", token.type = evl_token::SINGLE,
    token.line_no = 4, token.str = "endmodule", token.type = evl_token::NAME;
//}
tokens.push_back(token);

我在C++程序中得到的输出只显示最后一行是4行，如果C++我的列表给出了我想要的输出，我应该怎样处理列表？

Answer 1

您可以使用与c＃中几乎相同的语法。

• 统一初始化（对于evl_token）这里使用与成员在类中声明的顺序相同的顺序
• c＃list <=> c ++ vector（c＃LinkedList <=> c ++ list）

---

#include <vector>
#include <string>
struct evl_token
{
    enum token_type { NAME, NUMBER, SINGLE };
    int line_no;
    std::string str;
    token_type type;
};

std::vector<evl_token> tokens
{
    { 1,  "module",  evl_token::token_type::NAME},
    { 1,  "top",  evl_token::token_type::NAME},
    { 1,  ";",  evl_token::token_type::SINGLE},
    { 2,  "wire",  evl_token::token_type::NAME},
    { 2,  "in",  evl_token::token_type::NAME},
    { 2,  ",",  evl_token::token_type::SINGLE},
    { 2,  "out",  evl_token::token_type::NAME},
    { 2,  ";",  evl_token::token_type::SINGLE},
    { 3,  "not",  evl_token::token_type::NAME},
    { 3,  "(",  evl_token::token_type::SINGLE},
    { 3,  "out",  evl_token::token_type::NAME},
    { 3,  ",",  evl_token::token_type::SINGLE},
    { 3,  "in",  evl_token::token_type::NAME},
    { 3,  ")",  evl_token::token_type::SINGLE},
    { 3,  ";",  evl_token::token_type::SINGLE},
    { 4,  "endmodule",  evl_token::token_type::NAME}
};

Answer 2

您需要添加您创建的每个令牌。从C ++ 11开始，您可以使用列表初始化语法。

struct evl_token
{
    enum token_type { NAME, NUMBER, SINGLE };
    token_type type;
    std::string str;
    int line_no;
}; //struct evl_token

std::vector<evl_token> tokens;
tokens.push_back({ evl_token::NAME,"module",1 });
tokens.push_back({ evl_token::NAME,"top",1 });
tokens.push_back({ evl_token::SINGLE,";",2 });
...