使用初始化器列表初始化包含const数组的结构体

本文介绍了使用初始化器列表初始化包含const数组的结构体的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我使用C ++ 11并且有一个包含以下结构的类：

struct设置{ const std :: string name; const std :: string * A; const size_t a; }; class X { static const设置s; //更多的东西};

在 .cpp 像这样定义

X :: s = {MyName，{one，two，three }，3};

但这不起作用。但它使用中间变量工作

const std :: string inter [] = {one，two 三}; X :: s = {MyName，inter，3};有没有办法没有中间变量？

div class =h2_lin>解决方案

指针不能从值列表中初始化。您可以改用 std :: vector ：

#include<向量> struct设置{ const std :: string name; const std :: vector< std :: string>一个; // ^^^^^^^^^^^^^^^ const size_t a; };

然后您可以写：

class X { static const Settings s; //更多的东西}; const设置X :: s = {MyName，{one，two，three}，3}

这里是 。

如Praetorian在建议中所建议，您可能需要替换 std ::向量与 std :: array ，如果您可以明确指定容器的大小，如果大小不需要在运行时更改：

#include< array> struct设置{ const std :: string name; const std :: array< std :: string，3>一个; // ^^^^^^^^^^^^^^^^^ const size_t a; };

这里是 生活示例 。

I working with C++11 and have a Class containing the following Struct:

struct Settings{ const std::string name; const std::string* A; const size_t a; }; class X { static const Settings s; //More stuff };

In the .cpp file I want to define it like this

X::s = {"MyName", {"one","two","three"}, 3};

But this does not work. However it does work using an intermediate variable

const std::string inter[] = {"one","two","three"}; X::s = {"MyName", inter, 3};

Is there a way to do it without the intermediate variable?

解决方案

A pointer cannot be initialized from a list of values. You could use std::vector instead:

#include <vector> struct Settings{ const std::string name; const std::vector<std::string> A; // ^^^^^^^^^^^^^^^^^^^^^^^^ const size_t a; };

You can then write:

class X { static const Settings s; //More stuff }; const Settings X::s = {"MyName", {"one","two","three"}, 3};

Here is a live example.

As suggested by Praetorian in the comments, you may want to replace std::vector with std::array, if it is acceptable for you to specify the size of the container explicitly, and if the size does not need to change at run-time:

#include <array> struct Settings{ const std::string name; const std::array<std::string, 3> A; // ^^^^^^^^^^^^^^^^^^^^^^^^^^ const size_t a; };

And here is the live example.