没有匹配的函数 - ifstream open（） [英] No matching function - ifstream open()

问题描述

这是代码的一部分出现错误：

This is the part of the code with an error:

std::vector<int> loadNumbersFromFile(std::string name)
{
    std::vector<int> numbers;

    std::ifstream file;
    file.open(name); // the error is here
    if(!file) {
        std::cout << "\nError\n\n";
        exit(EXIT_FAILURE);
    }

    int current;
    while(file >> current) {
        numbers.push_back(current);
        file.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
    }
    return numbers;
}

好吧，我不知道发生了什么。整个事情在VS中正确编译。但我需要编译这个与开发cpp。

And well, I kind of have no idea what is going on. The whole thing compiles properly in VS. However I need to compile this with dev cpp.

我在上面的代码中注释掉了抛出错误的行。错误是：

I commented out the line throwing errors in the code above. The errors are:

没有匹配的函数调用'std :: basic_ifstream :: open（std :: string&）

没有匹配的函数调用'std :: basic_ofstream :: open（std :: string&）

no matching function for call 'std::basic_ifstream::open(std::string&)
no matching function for call 'std::basic_ofstream::open(std::string&)

在代码的不同部分，例如'numeric_limits不是std'的成员，或'max（）没有被声明'，虽然他们存在于iostream类中，一切都在VS中工作。

In different parts of code I get errors like 'numeric_limits is not a member of std', or 'max() has not been declared', although they exist in iostream class and everything works in VS.

为什么会收到此错误？

推荐答案

更改为：

file.open(name.c_str());

或者只是使用构造函数，因为没有理由分开构造并打开：

or just use the constructor as there is no reason to separate construction and open:

std::ifstream file(name.c_str());

支持 std :: string 参数添加到c ++ 11中。

Support for std::string argument was added in c++11.

As loadNumbersFromFile（）不修改其参数传递 std :: string const& 避免不必要的复制

As loadNumbersFromFile() does not modify its argument pass by std::string const& to document that fact and avoid unnecessary copy.

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