简单代码需要帮助 - 没有构造函数的实例匹配参数列表 [英] Simple Code Need Help - no instance of constructor matches argument list

问题描述

我跟着一本关于C ++编程的书，我被卡住了。这本书的例子是：

I am following a book on C++ programming and I got stuck on vectors. The example from the book goes:

vector<int> v = {1,2,3};

但我收到错误：

    1   IntelliSense: no instance of constructor "Vector<T>::Vector [with T=int]" matches the argument list
        argument types are: (int, int, int) ../path

此外，当我创建字符串向量：

Also, when I create string vector:

vector<string> v = {"one", "two", "three"}

/ p>

I get this error:

    1   IntelliSense: no instance of constructor "Vector<T>::Vector [with T=std::string]" matches the argument list
        argument types are: (const char [4], const char [4], const char [6]) ../path

我使用VS 2013和2013年11月的CTP编译器。

I am using VS 2013 with Nov 2013 CTP compiler. What am I doing wrong?

推荐答案

总结并扩展评论中写的内容和Bjarne Stroustrup的 std_lib_facilities.h 标题：

To summarize and expand upon what was written in the comments and Bjarne Stroustrup's "std_lib_facilities.h" header:

• 为了教学目的，标题包含一个小写范围检查的向量类 Vector / li>
  

• 使向量的无缝替换标准库（再次，为教学目的），标题包含以下行：

• The header contains a trivially range-checked vector class called Vector for teaching purposes;

• To make Vector a "seamless" replacement for vector in the standard library (again, for teaching purposes), the header contains the following lines:

// disgusting macro hack to get a range checked vector:
#define vector Vector

OP可能使用头版本（这是 std_lib_facilities.h 的顶部Google搜索结果），其 Vector 没有 initializer_list 构造函数（该版本使用C ++ 98，没有初始化列表）。

抱怨 Vector 在看到 vector< int>时没有匹配的构造函数。 v = {1,2,3}; ，它变成 Vector< int>

The OP likely used the header for the first edition of the book (it's the top Google search result for std_lib_facilities.h), whose Vector doesn't have an initializer_list constructor (that edition uses C++98, which doesn't have initializer lists).

As a result, the compiler complains that Vector doesn't have a matching constructor when it sees vector<int> v = {1,2,3};, which becomes Vector<int> v = {1,2,3}; after macro replacement.

要修复此问题，请下载并使用标题的正确版本。

To fix the problem, download and use the correct version of the header.

这篇关于简单代码需要帮助 - 没有构造函数的实例匹配参数列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！