问题描述
我今天在一个程序中遇到了一个有趣的情况,我无意中将一个无符号整数分配给了一个 std::string.VisualStudio C++ 编译器没有给出任何警告或错误,但我在运行项目时碰巧注意到了这个错误,它为我的字符串提供了垃圾字符.
I encountered an interesting situation today in a program where I inadvertantly assigned an unsigned integer to a std::string. The VisualStudio C++ compiler did not give any warnings or errors about it, but I happened to notice the bug when I ran the project and it gave me junk characters for my string.
代码大概是这样的:
以下代码也可以很好地编译:
The following code also compiles fine:
以下导致错误:
这是怎么回事?为什么编译器会用最后一个代码块停止构建,而让前 2 个代码块构建?
What is going on? How come the compiler will stop the build with the last code block, but let the first 2 code blocks build?
推荐答案
因为 string 可以从 char
赋值,而 int
可以隐式转换为 char.
Because string is assignable from char
, and int
is implicitly convertible to char
.
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