c++ - 这是否像 learncpp.com 声称的那样是 GCC 错误？

Question

在 C++ 学习网站( https://www.learncpp.com/cpp-tutorial/6-9a-dynamically-allocating-arrays/ )中，有人声称 GCC 在涉及 new 运算符时存在与 C 样式字符串初始化相关的错误:

As of the time of writing, the GCC still has a bug where initializing a dynamically allocated array of chars using a C-style string literal causes a compiler error:

char *array = new char[14] { "Hello, world!" }; // doesn't work in GCC, though it should

我使用的是 GCC 版本 7.4.0。

如果我尝试编译此摘录，我会得到:

error: invalid conversion from ‘const char*’ to ‘char’ [-fpermissive]
     char *array = new char[14] { "Hello, world!" };

如果我尝试编译这样的代码:

char *array = new char[14] {'H', 'e', 'l', 'l', 'o', 0}

然后它就会按预期工作。

我假设这被认为是一个错误，因为:

char array[14]{ "Hello, world!" };

按预期工作。

我找不到这方面的更多信息。有人能确认或否认这是一个 GCC 错误吗？

Answer 1

是的，这是一个 GCC 错误。错误跟踪器中的相关问题是 77841 。引用那边的描述:

5.3.4 New [expr.new] p.17.2
Otherwise, the new-initializer is interpreted according to the initialization rules of 8.5 for direct-initialization.

8.5 Initializers [dcl.init] p.17.1
If the initializer is a (non-parenthesized) braced-init-list, the object or reference is list-initialized (8.5.4).

8.5.4 List-initialization [dcl.init.list] p.3.2
Otherwise, if T is a character array and the initializer list has a single element that is an appropriately-typed string literal (8.5.2), initialization is performed as described in that section.

因此，问题中的 new 表达式应该格式良好，就像数组对象的直接初始化一样。

无法预测何时修复。还是reproducible in GCC's trunk截至撰写本文时。