Effective C++ 筆記 —— Item 8: Prevent exceptions from leaving destructors.
use RestTemplate ,you can comsume Restful web service
使用RestTemplate,可以訪問Restful web服務，即可以傳送網路請求。
這是RestTemplate最基本的用法，無引數請求，返回一個Quote物件
有很多方法，傳什麼引數，返回什麼型別的資料都能看出來，其他的怎麼用還不知道。
我在自己寫測試案例的時候，是自己建立的RestTemplate物件，這顯然是不符合IOC的。
這是官方的方法，應該是使用了工廠代理模式，呼叫方法來生成RestTemplate物件。
不甚理解，這兩個方法，都沒有被呼叫過，卻都執行了。沒呼叫過，引數是怎麼傳進去的呢？
indicate that any properties not bound in this type should be ignored.
把屬性值多的物件，賦給屬性值少的物件會怎麼樣呢？
本文來自部落格園，作者：北征愚人，轉載請註明原文連結：https://www.cnblogs.com/xukd/p/15222600.html
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Effective C++ 筆記 —— Item 8: Prevent exceptions from leaving destructors.
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Effective C++ 筆記 —— Item 2: Prefer consts, enums, and inlines to #defines
When you do something like this: #define ASPECT_RATIO 1.653 Because #define may be treated as if it\'s not part of the language per se. The name you defined may not get entered into the symbol tabl
Effective C++ 筆記 —— Item 3: Use const whenever possible
The following functions take the same parameter type: void f1(const Widget *pw); // f1 takes a pointer to a constant Widget object
Effective C++ 筆記 —— Item 4: Make sure that objects are initialized before they’re used
In a constructor, prefer use of the member initialization list to assignment inside the body of the constructor. List data members in the initialization list in the same order they\'re declared in the
Effective C++ 筆記 —— Item 5: Know what functions C++ silently writes and calls
For an enpty class, if you don\'t declare them yourself, compilers will declare their own versions of a copy constructor, a copy assignment operator, and a destructor. Furthermore, if you declare no c
Effective C++ 筆記 —— Item 10: Have assignment operators return a reference to *this.
For this code: int x, y, z; x = y = z = 15; // chain of assignments The way this is implemented is that assignment returns a reference to its left-hand argument, and that’s the convention you sho
Effective C++ 筆記 —— Item 13: Use objects to manage resources.
Consider this code: class Investment { /*...*/ }; // root class of hierarchy of investment types Investment* createInvestment(); // return ptr to dynamically allocated object in the Investment hier
Effective C++ 筆記 —— Item 19: Treat class design as type design.
How do you design effective classes? First, you must understand the issues you face. Virtually every class requires that you confront the following questions, the answers to which often lead to const
Effective C++ 筆記 —— Item 29: Strive for exception-safe code.
Suppose we have a class for representing GUI menus with background images. The class is designed to be used in a threaded environment, so it has a mutex for concurrency control:
Effective C++ 筆記 —— Item 32: Make sure public inheritance models "is-a."
Consider this code: class Rectangle { public: virtual void setHeight(int newHeight); virtual void setWidth(int newWidth);
Effective C++ 筆記 —— Item 36: Never redefine an inherited non-virtual function.
Consider: class B { public: void mf(); // ... }; class D : public B { /*...*/ }; D x; // x is an object of type D
Effective C++ 筆記 —— Item 42: Understand the two meanings of typename.
Question: what is the difference between class and typename in the following template declarations? template<class T> class Widget; // uses \"class\"
Effective C++ 筆記 —— Item 44: Factor parameter-independent code out of templates.
For example, suppose you\'d like to write a template for fixed-size square matrices that, among other things, support matrix inversion.
Effective C++ 筆記 —— Item 46: Define non-member functions inside templates when type conversions are desired.
Item 24 explains why only non-member functions are eligible for implicit type conversions on all arguments, and it uses as an example the operator* function for a Rational class.
Effective C++ 筆記 —— Item 48: Be aware of template metaprogramming.
Template metaprogramming (TMP) is the process of writing template-based C++ programs that execute during compilation. Think about that for a minute: a template metaprogram is a program written in C++
Effective C++ 筆記 —— Item 50: Understand when it makes sense to replace new and delete.
Let\'s return to fundamentals for a moment. Why would anybody want to replace the compiler-provided versions of operator new or operator delete in the first place? These are three of the most common r
Effective C++ 筆記 —— Item 51: Adhere to convention when writing new and delete.
The return value part of operator new is easy. If you can supply the requested memory, you return a pointer to it. If you can\'t, you follow the rule described in Item 49 and throw an exception of typ
Effective C++ 筆記 —— Item 52: Write placement delete if you write placement new.
When you write a new expression such as this: Widget *pw = new Widget; two functions are called: one to operator new to allocate memory, a second to Widget\'s default constructor. Suppose that the f
Effective C++ 筆記 —— Item 53: Pay attention to compiler warnings.
Many programmers routinely ignore compiler warnings. After all, if the problem were serious, it would be an error, right? This thinking may be relatively harmless in other languages, but in C++, it\'s
Effective C++ 筆記(1)
第一部分: 讓自己習慣C++ 條款01:視C++為一個語言聯邦 請記住 -C++高效程式設計守則視狀況而變化,取決於你使用C++的哪一部分。