C++ 编译“错误：预期的构造函数、析构函数或类型转换在‘=’标记之前”
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c++ compiling "error: expected constructor, destructor, or type conversion before '=' token "
提问by lukmac
Very simple codes located in the same file 'foo.h':
位于同一文件 'foo.h' 中的非常简单的代码：
class Xface
{
public:
uint32_t m_tick;
Xface(uint32_t tk)
{
m_tick=tk;
}
}
std::map<uint32_t, Xface*> m;
Xface* tmp;
tmp = new Xface(100); **//Error**
m[1] = tmp; **//Error**
tmp = new Xface(200); **//Error**
m[2] = tmp; **//Error**
The error is error: expected constructor, destructor, or type conversion before '=' tokenfor every assignment.
错误是 错误：每次赋值的“=”标记之前的预期构造函数、析构函数或类型转换。
回答by Randolpho
C++ is not a scripting language. You can declare items outside the bounds of an executable block of code, but you cannot do any processing. Try moving the erroring code into a function like this:
C++ 不是脚本语言。您可以在可执行代码块的范围之外声明项目，但不能进行任何处理。尝试将错误代码移动到这样的函数中：
int main()
{
std::map<uint32_t, Xface*> m;
Xface* tmp;
tmp = new Xface(100); **//Error**
m[1] = tmp; **//Error**
tmp = new Xface(200); **//Error**
m[2] = tmp; **//Error**
}
回答by gruszczy
Your code must be inside some function, you can't just put it in void :-) Try running the same code in main and see, what happens.
你的代码必须在某个函数内，你不能把它放在 void 中 :-) 尝试在 main 中运行相同的代码，看看会发生什么。
回答by gruszczy
class Xface
{
public:
uint32_t m_tick;
Xface(uint32_t tk)
{
m_tick=tk;
}
} // need a semicolon here
You are missing a semicolon at the end of the class definition.
您在类定义的末尾缺少分号。
回答by David Thornley
You have no default constructor. You need to have a constructor that doesn't need any arguments. Right now, you've got a constructor that needs a uint32_t, so you can't newan array of them. Not to mention, as Neil pointed out, the missing semicolon, and gruszczy's observation that executable code needs to be in a function.
您没有默认构造函数。您需要有一个不需要任何参数的构造函数。现在，您有一个需要 a 的构造函数uint32_t，因此您不能new使用它们的数组。更不用说，正如 Neil 指出的那样，缺少分号，以及 gruszczy 的观察，即可执行代码需要在函数中。
