const int &ra=a; ra=1; //错误 a=1; //正确 例2 string foo( ); void bar(string & s); 那么下面的表达式将是非法的: bar(foo( )); bar("hello world"); 原因在于foo( )和"hello world"串都会产生一个临时对象,而在C++中,这些临时对象都是const类型的。因此上面的表达式就是试图将一个const...
1. array 数组 2. reference 引用 3. element 元素 4. address 地址 5. sort 排序 6. character 字符 7. string 字符串 8. application 应用 函数: 1.call 调用 2.return value 返回值 3.function 函数 4. declare 声明 5. `parameter 参数 6.static 静态的 7.extern 外部的 指针: 1. pointer 指针...
ClauseImporterLazy is typically used by interface action classes as a construction parameter to control the importing behavior. Example: interactiveHelper.performAction(new InterfaceActionAddSourceDataStore(sourceDataStore1, dataSet, new BasicAliasComputer(), new ClauseImporterLazy(), new AutoMappingComputer...
如果想要禁止非const引用传递const对象,有三种选择 * 使用static_assert触发一个编译期错误代码如下: template<typename T> void printR(T& args) { static_assert(!std::is_const<T>::value, "out parameter of foo<T>(T&) is const"); } } 通过使用std::enable_if<>禁用该情况下模板 template<typenam...
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在上面程序所示的代码中, a ,b 和c 是引用参数( reference parameter ) 。如果用语句Abc (x, y, z ) 来调用函数Abc,其中x、y 和z 是相同的数据类型,那么这些实际参数将被分别赋予名称a,b 和c,因此,在函数Abc 执行期间,x、y 和z 被用来替换对应的a,b 和c。与传值参数的情况不同,在函数被调用时,...
针对此问题的探索来源于我们通常使用的默认参数,类似于 void NullTest(String str1, string str2 = "default") 这种形式的代码经常使用。...这里用到了两个特性标记(OptionalAttribute和DefaultParameterValueAttribute),这两个特性是clr底层支持,写在Param table中,结合生成的il代码,提供了参数约束的能力 52890 Oracl...
nCheck Specifies the check state. This parameter can be one of the following:Expand table ValueMeaning BST_UNCHECKED Set the button state to unchecked. BST_CHECKED Set the button state to checked. BST_INDETERMINATE Set the button state to indeterminate. This value can be used only if the ...
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Typically you should use the default value of TRUE for the bModified parameter. To mark a document as clean (unmodified), call this function with a value of FALSE.CDocument::SetPathNameCall this function to specify the fully qualified path of the document's disk file....