Recent questions tagged C++

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c++ - use getline and while loop to split a string

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

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c++ - Euler angle to Quaternion then Quaternion to euler angle

I'm using lib glm (http://glm.g-truc.net/) for test quaternion but I've a problem; when I convert euler angle ... z= -90 thank you in advance o/ 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++ - Storing unicode UTF-8 string in std::string

In response to discussion in Cross-platform strings (and Unicode) in C++ How to deal with Unicode strings ... without needing to manipulate it? 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++ - SFINAE + sizeof = detect if expression compiles

I just found out how to check if operator<< is provided for a type. template<class T> T& ... declarations lvalue_of_type and rvalue_of_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++ - Iterating Variadic Macro Arguments

I am programmatically generating bunch of functors, in order to keep the generated code more readable I am trying ... , only names will differ. 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++ - Int tokenizer

I know there are string tokenizers but is there an "int tokenizer"? For example, I want to split the string ... that didn't use strings. 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 ONE basic arithmetic operation in for loop body executed SLOWER THAN TWO arithmetic operations?

While I experimented with measuring time of execution of arithmetic operations, I came across very strange behavior. ... (quite noticeable). 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++ - Encrypting / obfuscating a string literal at compile-time

I want to encrypt/encode a string at compile time so that the original string does not appear in the compiled ... to achieve what I want? 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++ - cmake simple config file example

Now I have a lib I made my self that I want to use in another CMake c++ project. It exists in ... really know which answer should be accepted. 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++ - Should I use DirectInput or Windows message loop?

I'm working on a C++ DirectX 2D game and I need keyboard and mouse input. Wikipedia says: Microsoft ... a windows message loop. 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++ power of integer, template meta programming

I want to make a function which returns a power of integer. Please read the fmuecke's solution in power of ... in std::integral_const::value. 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 do I properly implement a "minimize to tray" function in Qt?

How do I properly implement a "minimize to tray" function in Qt? I tried the following code inside QMainWindow: ... seem to do anything, either. 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++ - Give a name to a boost thread?

Is it possible to give a name to a boost::thread so that the debuggers tables and the crash logs can be more readable? How? See Question&Answers more detail:os...

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

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119 views

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c++ - Boost shared_lock. Read preferred?

I was checking out the boost library(version 1.45) for a reader/writer lock. When I ran my tests on ... all subsequent read operations to block. 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++ - Parsing XML Attributes with Boost

I would like to share with you an issue I'm having while trying to process some attributes from XML ... advice will be much appreciated. 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++ - Link-time optimization and inline

In my experience, there's lot of code that explicitly uses inline functions, which comes at a tradeoff: The code ... defined in a class body. See Question&Answers more detail:os...

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

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261 views

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c++ - Custom Skip Parser with Boost::Spirit

The standard ascii::space_type skipper does of course not skip my comments. The docs mention you can make your own ... dealing with Spirit 1.6. 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++ - FileStorage for OpenCV Python API

I'm currently using FileStorage class for storing matrices XML/YAML using OpenCV C++ API. However, I have to ... generated by OpenCV C++ API 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 pass an argument to boost::thread?

thread_ = boost::thread( boost::function< void (void)>( boost::bind( &clientTCP::run , this ) ) ); is ... :thread call should be written 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++ - Is there STDCALL in Linux?

I'm trying to port a Windows app to Linux. This appplication marks some functions with the __stdcall attribute. However ... to Linux at all)? See Question&Answers more detail:os...

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

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281 views

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c++ - Determine array size in constructor initializer

In the code below I would like array to be defined as an array of size x when the Class constructor is called. How can I ... int x) : ??? { } } See Question&Answers more detail:os...

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

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387 views

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c++ - Need Advice on Implementing a Time-limited Trial

I'm developing a shareware desktop application. I'm to the point where I need to implement the trial-use/ ... Linux. Thanks for your advice! See Question&Answers more detail:os...

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

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305 views

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c++ - How to link Boost in a dependent static library

In MS Visual C++ 2010 I had a single C++ project in my solution which used boost and worked perfectly ... "libboost_date_time-vc100-mt-1_45.lib" See Question&Answers more detail:os...

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

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257 views

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c++ - When to use boost::optional and when to use std::unique_ptr in cases when you want to implement a function that can return "nothing"?

From what I understand there are 2* ways you can implement a function that sometimes doesnt return a result(for ... prefere one over the other? 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++ - Two dimensional array using vector

I want to create 2D array using vector. But, when I do this, I get seg fault. Can anyone please explain what I ... ; // error here return 0; } See Question&Answers more detail:os...

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

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110 views

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c++ - How does the following code work?

#define TYPE_CHECK(T, S) while (false) { *(static_cast<T* volatile*>(0)) = static_cast<S*>(0); } I ... ? Can someone explain those lines? 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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175 views

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c++ - Using tuple in unordered_map

I want to use tuple consisting of int,char,char in my unordered_map. I am doing like this: #include <string> ... I am doing wrong in this? See Question&Answers more detail:os...

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

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219 views

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c++ - How to properly use qRegisterMetaType on a class derived from QObject?

I've been searching far and wide for an answer to this but to no avail. My lament is as follows: I have ... of them tackle this exact 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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