Recent questions tagged C++

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c++ - How to create a game loop with xlib

I am trying to create a game loop for an xlib window, but I cannot manage to paint the window correctly. ... am I implementing it incorrectly? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - how to set char * value from std string (c_str()) not working

i dont know but this not working for me im getting garbege value when i try to set char * value from function ... get garbage printf("%s",cc); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - assigning to rvalue: why does this compile?

In the following example: class A { private: double content; public: A():content(0) {} A operator+( ... returning a reference from operator+. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Class design vs. IDE: Are nonmember nonfriend functions really worth it?

In the (otherwise) excellent book C++ Coding Standards, Item 44, titled "Prefer writing nonmember nonfriend functions" ... you deal with that? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Undefined symbols for architecture i386:

I've recently moved over to a mac, and am struggling using the command line compilers. I'm using g++ to compile ... 0; } along with the usual See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is the copy constructor not called?

class MyClass { public: ~MyClass() {} MyClass():x(0), y(0){} //default constructor MyClass(int X, ... for the second instance of MyClass? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Create custom #warning flags

I'm building a commercial app, and we are using some GPL code to help us along. How can I add #warning or ... Objective-C++ with gcc or clang. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ cli - unmanaged var as member of managed class c++

I'm novice in .net c++ and trying to create class looking like: public ref class Klient { public: Klient(){ ... What's wrong with this code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is it well-defined to compare with a value-initialized iterator?

Does the following program invoke undefined behavior? #include <iostream> #include <iterator> int main(int argc, char* ... of the same type. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Defining a function with different signature

Today I discovered that it is possible to declare a function in a header with one signature, and implement it in ... a warning or an error. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - string s; &s+1; Legal? UB?

Consider the following code: #include <cstdlib> #include <iostream> #include <string> #include <vector> #include < ... is also an array? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Dynamic arrays and memory management in Delphi

The following article on dynamic arrays in Delphi says that you allocate a dynamic array using the SetLength() function ... ; myObjects := nil; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - if constexpr(condition) as compile-time conditional

I want to use a constexpr bool (useF in the example below) to enable a feature in the following code. Here, calling A: ... 7.0.1 with -std=c++17 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How can I embed a Qt resource into a .dll file?

I have hundreds of HTML files in my project, and I don't want to compile all of these HTML files into an ... or other type of compiled library? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Socket listener for IPv6 and IPv4

I ported an application to support IPv6, using popular tutorials. I decided to use only one socket listener ... I misunderstand the problem? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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376 views

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c++ - In what order are global constructors called

In what order get the constructors of global object in C++ called? This question arises in the context of a ... cons of global objects called?" See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - To Mutex or Not To Mutex?

Do I need a mutex if I have only one reader and one writer? The reader takes the next command (food.front( ... a reader thread and send thread. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - openCV 2.4.7 error adding symbols: DSO missing from command line

i've got a Problem with a self compiled opencv... XUbuntu 13.10 x64 gcc version 4.8.1 cmake -D WITH_TBB ... missing from command line Any help? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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545 views

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c++ - `std::pair` `second` has incomplete type with `unordered_map` tree

I was reviewing some older code of mine and I saw the code using pointers to implement a tree of Variant ... be a separate new allocation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Unexpected Output when adding two float numbers

I wrote the following C++ code: float a, b; int c; a = 8.6; b = 1.4; c = a + b; ... between the two, as they are giving different outputs? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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528 views

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c++ - Construct-in-place an unmoveable object in a map

I'm trying to construct an object in a map that contains an atomic, so it can neither be copied nor moved AFAICT. My ... is gcc 4.8.1, on Linux See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Missing symbols from static library in linked executable

I have a problem with static library symbols missed in linked executable. Here is the description of my problem: I ... ??:/usr/local/ssl/lib64 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Difference between local scope and function scope

Once I assumed that these two have the same meaning but after reading more about it i'm still not clear about ... labels have a function scope? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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484 views

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c++ - How does boost::ptr_vector deep copy the underlying objects?

ptr_vector is copy constructible and copy assignable. How can it deep copy the underlying objects when it doesn't know their concrete types? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How can I improve this design that forces me to declare a member function const and declare variables mutable?

For some reason I am iterating over elements of a class in an std::set and would like to slightly modify ... remove mutable and const? Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is the difference between IND and NAN numbers

A NAN value means Not A Number and IND value means Indeterminate number. But what is the difference between these ... represent both in c++. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Serialization of STL Class

is it possible serialize any STL class including std::string? I've a sets of std::strings and I'm trying to ... load them back into std::set. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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401 views

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c++ - Identical build on different systems

I have 3 build machines. One running on windows 2000, one with XP SP3 and one with 64bit Windows Server 2008 ... how that file should look like? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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