reference

问题 I have two Excel Workbooks: Source.xlsx Tool.xlsm Source.xlsx contains a Worksheet with the VBA Object Name shtTests : Let's assume that in Tool.xlsm I have a variable that contains a reference to the Workbook stored in Source.xlsx : Dim wkbSource as Workbook Set wkbSource = GetSourceWorkbook() ' Some function that gives a reference to the workbook Core Question: How can I reference shtTests within Tool.xlsm by using shtTests ' VBA Name ? Or to formulate the question as code... assume you

问题 I have two Excel Workbooks: Source.xlsx Tool.xlsm Source.xlsx contains a Worksheet with the VBA Object Name shtTests : Let's assume that in Tool.xlsm I have a variable that contains a reference to the Workbook stored in Source.xlsx : Dim wkbSource as Workbook Set wkbSource = GetSourceWorkbook() ' Some function that gives a reference to the workbook Core Question: How can I reference shtTests within Tool.xlsm by using shtTests ' VBA Name ? Or to formulate the question as code... assume you

问题 I'm wondering if there's a memory cost to having multiple "constant reference" variables in the same scope pointing to the same object: const Animal& animal = getAnimal(); const Dog& dog = static_cast<const Dog&>(animal); Conceptually, animal and dog are two variables, each of pointer size, and thus would take up 2 registers (or a 2*pointer-size region on the stack). But (assuming that there's no multiple inheritance etc.), the compiler could know that they both must hold the same pointer

问题 I have a class: class Symbol_t { public: Symbol_t( const char* rawName ) { memcpy( m_V, rawName, 6 * sizeof( char ) ); }; string_view strVw() const { return string_view( m_V, 6 ); }; private: char m_V[6]; }; // class Symbol_t and there is a lib-func that I can't modify: extern bool loadData( const string& strSymbol ); If there is a local variable: Symbol_t symbol( "123456" ); When I need to call loadData, I dare not do it like this: loadData( string( symbol.strVw().begin(), symbol.strVw().end

问题 I am a beginner to C++ and have the following question regarding the purpose of pointers where neither the address nor the value that it is pointing to can be changed ( constEverything in the example ). Example: int main() { int i = 1; int j = 2; int* const constPoint = &i; *constPoint = 3; // legal constPoint = &j; // illegal const int* constVal = &i; *constVal = 3; // illegal constVal = &j; // legal const int* const constEverything = &i; *constEverything = 3; // illegal constEverything = &j

问题 The following program tries to grade the marks of a student: use std::io; fn main() { let mut in0 = String::new(); io::stdin().read_line(&mut in0).expect("stdin err"); let n: i32 = in0.trim().parse().expect("parse err"); println!("{}", n); let mut v: Vec<i32> = Vec::new(); for _ in 0..n { let mut inp = String::new(); io::stdin().read_line(&mut inp).expect("stdin err"); let num: i32 = inp.trim().parse().unwrap(); v.push(num); } let out: Vec<_> = v .iter() .map(|x| { if x < 38 { x } else if x %

问题 I'd like to convert a tuple of references (which are all references to members of the same struct) to a reference of a tuple. I've tried to coerce them in various ways, however I wasn't able to do it without cloning. struct Bar(); struct Foo(Bar, Bar, Bar); fn main() { let a: &Foo = &Foo(Bar(), Bar(), Bar()); let b: &(Bar, Bar) = &(a.0, a.1); } error[E0507]: cannot move out of borrowed content --> src/main.rs:7:28 | 7 | let b: &(Bar, Bar) = &(a.0, a.1); | ^^^ cannot move out of borrowed

问题 Why is an array evaluated to true when it is compared to its corresponding string? var a = [1,2,3]; var b = '1,2,3'; console.log(a==b);// true Variable a stores the memory address of the array it is assigned. Then how is a memory address equal to corresponding string of that array. 回答1: Well in case of "==", array is converted to toString and then compared due to loose comparison, so it equates to true. So what happens is this: var a = [1,2,3]; var b = '1,2,3'; a == b //is same as a.toString(

问题 I've the issue that I can't seem to figure out how to add references to certain solutions. In most of the solutions I start in Visual Studio '17 I see "References" in my solution explorer, but e.g. for a asp.net core web api I get "Dependencies" instead. Whenever the solution shows the "References" I can view the "assemblies" tab in the "Reference Manager", but for solutions that have the "Depedencies" I can't see it ( as shown in example below ). 回答1: .Net core only works with NuGet packages

问题 I've the issue that I can't seem to figure out how to add references to certain solutions. In most of the solutions I start in Visual Studio '17 I see "References" in my solution explorer, but e.g. for a asp.net core web api I get "Dependencies" instead. Whenever the solution shows the "References" I can view the "assemblies" tab in the "Reference Manager", but for solutions that have the "Depedencies" I can't see it ( as shown in example below ). 回答1: .Net core only works with NuGet packages