Recent questions tagged C++

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c++ - Where are member functions stored for an object?

I'm experimenting with C++ to understand how class/structures and their respective objects are laid out in memory ... ; doesn't even compile? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Which greedy initializer-list examples are lurking in the Standard Library?

Since C++11, the Standard Library containers and std::string have constructors taking an initializer-list. ... an initializer-list constructor? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Function Pointers in Objective C

Quick question. Does anyone know how to get the function pointer of an objective c method? I can declare a ... c class. Any suggestions? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Specification of source charset encoding in MSVC++, like gcc "-finput-charset=CharSet"

I want to create some sample programs that deal with encodings, specifically I want to use wide strings like: ... answer: There is no solution See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why do functions/objects inside anonymous namespace have external linkage?

Why don't symbols (functions and variables) that are defined in an anonymous namespace have internal linkage as ... to have external linkage? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - QT4: Transparent Window with rounded corners

How can I create a partially transparent window with rounded borders (no standard borders)? (I used Qt:: ... help would be highly appreciated. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What difference between rand() and random() functions?

Once, my teacher taught me to use randomize() and random() function for generating pseudorandom numbers in C++ Builder ... is it better to use? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Reference as class member initialization

I want to initialize a property of a class that holds a reference to another class by passing such a reference ... ; int numOfHotels; }; #endif See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Should `const` and `constexpr` variables in headers be `inline` to prevent ODR violations?

Consider the following header and assume it is used in several TUs: static int x = 0; struct A { A ... constexpr variables in headers as inline? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Can undefined behavior erase the hard drive?

From "Effective C++ 3rd edition by Scott Meyers": To emphasize that the results of undefined behavior are not ... C++ program or thread? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - comma operator in if condition

int a = 1, b = 0; if(a, b) printf("success "); else printf("fail "); if(b, a) printf(" ... success Why this behavior? Could you please explain? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why must C# operator overloads be static?

Why does C# require operator overloads to be static methods rather than member functions (like C++)? (Perhaps ... motivation for this decision?) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Acquire/release semantics with 4 threads

I am currently reading C++ Concurrency in Action by Anthony Williams. One of his listing shows this code, ... acquire prevents this reordering. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the rationale for limitations on pointer arithmetic or comparison?

In C/C++, addition or subtraction on pointer is defined only if the resulting pointer lies within the original ... answer, I am doubting this. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Error: C2228: left of '' must have class/struct/union

I'm a long time Java user learning C++ with Qt and I'm having a lot of trouble understanding how methods work ... which it very well may not be) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Which is faster/preferred: memset or for loop to zero out an array of doubles?

double d[10]; int length = 10; memset(d, length * sizeof(double), 0); //or for (int i = length; i--;) d[i] = 0.0; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What's the time complexity of iterating through a std::set/std::map?

What's the time complexity of iterating through a std::set/std::multiset/std::map/std::multimap? I ... specified in the language standard? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Reason for using non-type template parameter instead of regular parameter?

In C++ you can create templates using a non-type template parameter like this: template< int I > void add( ... but couldn't find anything). See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Convert const char* to wstring

I'm working on a native extension for a zinc based flash application and I need to convert a const char* to ... OSX and Windows XP/Vista/7 See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is an iterator in general?

This problem comes up when I tried to write a C++ class template with ctor that accept "general iterator". I don' ... and it's just a class) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How can std::bitset be faster than std::vector<bool>?

According to this answer the poster expects a std::bitset of size 100k bits to be faster than a std::vector< ... sizes just like std::vector? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Same function with const and without - When and why?

T& f() { // some code ... } const T& f() const { // some code ... } I've seen this a couple ... can be called for non-const variables as well. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is it disallowed for partial specialization in a non-type argument to use nested template parameters

I have this code template<int N, bool C = true> struct A; template<int N> struct A<N, ... the more straightforward partial specialization? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is codecvt not a std header?

This code compiles with Visual C++ 11 and runs as expected on Windows 7 but fails to compile using either MinGW ... : No such file or directory. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the difference between std::quick_exit and std::abort and why was std::quick_exit needed?

C++11 introduces a new way of finishing program execution-std::quick_exit. Quoting the N3242 18.5 (p ... for introducing this function? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Comparing std::functions for equality?

How can I compare two C++11 std::functions with operator==, and return true if both of said functions refer to the same function pointer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Increment void pointer by one byte? by two?

I have a void pointer called ptr. I want to increment this value by a number of bytes. Is there a way to do this? ... )(++((char *) ptr)); ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Significance of Sleep(0)

I used to see Sleep(0) in some part of my code where some infinite/long while loops are available. I was ... any significance for Sleep(0)? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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