字符串常量前的预期标识符 [英] expected identifier before string constant

问题描述

具有这样的程序:

#include <iostream>
#include <string>
using namespace std;
class test
{
public:
    test(std::string s):str(s){};
private:
    std::string str;
};

class test1
{
public:
    test tst_("Hi");
};

int main()
{
    return 1;
}

...为什么我执行时会得到以下内容

…why am I getting the following when I execute

g ++ main.cpp

g++ main.cpp

main.cpp:16:12: error: expected identifier before string constant
main.cpp:16:12: error: expected ‘,’ or ‘...’ before string constant

推荐答案

您不能在声明它的位置初始化tst_.这仅适用于静态const基本类型.相反，您将需要具有test1的构造函数.

You can not initialize tst_ where you declare it. This can only be done for static const primitive types. Instead you will need to have constructor for test1.

这是 ideone.com 中的一个有效示例.请注意我所做的一些更改-首先，最好让test的构造函数对字符串使用const引用以避免复制.第二-如果程序成功，则应返回0而不是1(返回1会在 ideone 中出现运行时错误)

here is a working example in ideone.com. Note a few changes I did - first it is better to have the constructor of test take a const reference to string to avoid copying. Second - if the program succeeds you should return 0 not 1(with return 1 you get runtime error in ideone)

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