Recent questions tagged C++

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I am so frustrated right now after several hours trying to find where shared_ptr is located. None of the ... Thanks for all the responses. 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++ - Reading from a text field in another application's window

Is there a way for a Windows application to access another applications data, more specifically a text input field in GUI, ... a how-to in C++. 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 to detect IP address change programmatically in Linux?

Is there a way to detect IP address changes on the local machine in Linux programmatically using C++? 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++ - Unique hardware ID in Mac OS X

Mac OS X development is a fairly new animal for me, and I'm in the process of porting over some software. For software ... Note: I'm using C++. 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++ - Best method for storing this pointer for use in WndProc

I'm interested to know the best / common way of storing a this pointer for use in the WndProc. I know of ... uses a hashtable lookup of HWNDs. 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++ - Move or Named Return Value Optimization (NRVO)?

Lets say we have the following code: std::vector<int> f() { std::vector<int> y; ... return y; ... either approach, according to the 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++ - Template specialization of a single method from a templated class

Always considering that the following header, containing my templated class, is included in at least two .CPP files, ... in VS 2008). Thanks! 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++ - Declare variables at top of function or in separate scopes?

Which is preferred, method 1 or method 2? Method 1: LRESULT CALLBACK wpMainWindow(HWND hwnd, UINT msg, WPARAM ... no matter what msg equaled? 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++ undefined references with static library

I'm trying to make a static library from a class but when trying to use it, I always get errors with ... collect2: ld returned 1 exit status 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++ - std::transform() and toupper(), no matching function

I tried the code from this question C++ std::transform() and toupper() ..why does this fail? #include < ... here? Is it GCC related problem? 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 to generate assembly code with clang in Intel syntax?

As this question shows, with g++, I can do g++ -S -masm=intel test.cpp. Also, with clang, I can do ... How do I get intel syntax with clang? 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++ - Need iterator when using ranged-based for loops

Currently, I can only do ranged based loops with this: for (auto& value : values) But sometimes I need ... the whole vector comparing values? 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++ - cin.ignore(numeric_limits<streamsize>::max(), ' ')

What does cin.ignore(numeric_limits<streamsize>::max(), ' ') mean in C++? Does it actually ignore the last input from the user? 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++ - Libraries in /usr/local/lib not found

I am building an application using a framework called ohNet. After building the framework, there is the ... solution for this? regards 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 the volatile qualifier used through out std::atomic?

From what I've read from Herb Sutter and others you would think that volatile and concurrent programming were ... be volatile or not? 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++ - Semicolon after class declaration braces

In C++ classes, why the semi-colon after the closing brace? I regularly forget it and get compiler ... might trap this before compilation. 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 uint_fast32_t and why should it be used instead of the regular int and uint32_t?

So the reason for typedef:ed primitive data types is to abstract the low-level representation and make it easier ... make the program faster? 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++ - Compiling Qt 4.8.x for Visual Studio 2012

What steps should I take to compile Qt (version 4.8.x) for Visual Studio 2012? I already carefully ... Qt sources before starting compilation. 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++ - Using boost thread and a non-static class function

So I have done some research, and have found you can create a boost::thread object and have it start with a ... seems good, but over my head. 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++ - The usage of anonymous enums

What is the purpose of anonymous enum declarations such as: enum { color = 1 }; Why not just declare int color = 1? 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++ - Enum vs Strongly typed enum

I am a beginner in C++ programming. Today I come across a new topic: strongly typed enum. I've researched ... , which will make me understand. 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 does LPCWSTR stand for and how should it be handled with?

First of all, what is it exactly? I guess it is a pointer (LPC means long pointer constant), but what ... demands on LPCWSTR. Please help. 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++ - Downcasting shared_ptr<Base> to shared_ptr<Derived>?

Update: the shared_ptr in this example is like the one in Boost, but it doesn't support shared_polymorphic_downcast ( ... refer to in this case? 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++ - Converting an int to std::string

What is the shortest way, preferably inline-able, to convert an int to a string? Answers using stl and boost will be welcomed. 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 I force cache coherency on a multicore x86 CPU?

The other week, I wrote a little thread class and a one-way message pipe to allow communication between ... used to enforce cache coherency. 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++ - At what point is it worth using a database?

I have a question relating to databases and at what point is worth diving into one. I am primarily an ... when first starting this project. 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 am I getting string does not name a type Error?

game.cpp #include <iostream> #include <string> #include <sstream> #include "game.h" #include "board.h" #include " ... ' does not name a type 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 a `=default` move constructor equivalent to a member-wise move constructor?

Is this struct Example { string a, b; Example(Example&& mE) : a{move(mE.a)}, b{move(mE.b)} { } ... operator=(Example&& mE) = default; } ? See Question&Answers more detail:os...

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

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