gcc 使用C++11列表初始化语法g++编译器时出错

xv8emn3q 于 2023-05-18 发布在其他

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当我使用列表初始化来初始化我的类成员时，编译器抱怨它是一个函数。
g++输出：

$ g++ main.cpp -o main 
In file included from main.cpp:1:
./Cat.h:9:9: error: function definition does not declare parameters
    int age{};
        ^
...

编译器版本：

$ g++ -v            
Apple clang version 14.0.3 (clang-1403.0.22.14.1)
Target: arm64-apple-darwin22.4.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

源代码，类别h：

...
class Cat {
private:
    int age{};
    std::string name{};
public:
    Cat(int age, std::string name) : age(age), name(std::move(name)) {
        std::cout << "Cat: Constructor with two parameter is called" << std::endl;
    }
...
};

main.cpp

#include "Cat.h"

Cat getCat() {
    Cat cat{1, "Kitty"};
    return cat;
}

int main() {
    Cat cat = getCat();
    return 0;
}

gcc

来源：https://stackoverflow.com/questions/76268292/error-when-using-c11-list-initialization-syntax-g-compiler

1条答案

按热度按时间

xwmevbvl1#

代码

#include <iostream>

class Cat {
private:
    int age{};
    std::string name{};
public:
    Cat(int age, std::string name) : age(age), name(std::move(name)) {
        std::cout << "Cat: Constructor with two parameter is called" << std::endl;
    }
};

Cat getCat() {
    Cat cat{1, "Kitty"};
    return cat;
}

int main()
{
    auto cat = getCat();
    return 0;
}

使用--std=c++17编译

/work/so/scratch/src/p0.cpp:8:9: warning: private field 'age'
      is not used [-Wunused-private-field]
    int age{};
        ^
1 warning generated.

编译时不使用--std=c++17

/work/so/scratch/src/p0.cpp:8:9: error: function definition
      does not declare parameters
    int age{};
        ^
/work/so/scratch/src/p0.cpp:9:17: error: function definition
      does not declare parameters
    std::string name{};
...

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gcc 使用C++11列表初始化语法g++编译器时出错

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