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F＃Lambda签名(F# Lambda Signature)

 我现在正在阅读克里斯史密斯的编程F＃，当我遇到兰巴达斯时试图找出F＃。 这是一个示例中的lambda  
let generatePowerOfFunc base = (fun exponent -> base ** exponent);;
 
 我得到它接收的东西并返回一个函数，但我没有得到的是这个函数的签名是val generatePowerOfFunc : float -> float -> float  
 它有三个花车而不是两个花车？ 当有这种方法时  
 let powerOfTwo = generatePowerOfFunc 2.0;;  
 它只有2个浮动val powerOfTwo : (float -> float)  
 也许我没有得到整个类型的签名协议。 任何帮助将非常感激。 谢谢 

I'm reading Programming F# by Chris Smith right now trying to figure out F# when i come across Lambadas. Here is a lambda from one of the examples 
let generatePowerOfFunc base = (fun exponent -> base ** exponent);;
 
I get that it takes in something and returns a function, but what i don't get is the Signature of this function which is val generatePowerOfFunc : float -> float -> float 
How does it have three floats instead of two? And when there's this method  
let powerOfTwo = generatePowerOfFunc 2.0;; 
It only has 2 floats val powerOfTwo : (float -> float) 
Maybe Im not getting the whole type signature deal. Any help would be much appreciated. Thanks

原文：https://stackoverflow.com/questions/7611034

更新时间：2022-12-27 22:12

最满意答案

 .eof()查看文件结束标志。 在运行文件末尾后设置该标志。 这是不可取的。  
 关于如何运作和最佳实践的博客文章可以在这里找到。  
 基本上，使用  
std::string line;
while(getline(file, line)) { ... }
 
 要么  
while (file >> some_data) { ... }
 
 因为它会在正确的时间发现错误和文件结束并采取相应的行动。 

.eof() looks at the end of file flag. The flag is set after you run over the end of the file. This is not desirable. 
A great blog post on how this works and best practice can be found here. 
Basically, use  
std::string line;
while(getline(file, line)) { ... }
 
or 
while (file >> some_data) { ... }
 
as it will notice errors and the end of the file at the correct time and act accordingly.

F＃Lambda签名(F# Lambda Signature)

最满意答案

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