Recent questions tagged C++

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c++ - How can std::make_heap be implemented while making at most 3N comparisons?

I looked in to the C++0x standard and found the requirement that make_heap should do no more than 3*N ... heaps in the reverse order. 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 volatile bool for thread control considered wrong?

As a result of my answer to this question, I started reading about the keyword volatile and what the consensus is ... you choose to solve 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++ - Is there a way to cancel/detach a future in C++11?

I have the following code: #include <iostream> #include <future> #include <chrono> #include <thread> using ... future to finish executing? 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++ - Skipping Incompatible Libraries at compile

When I try to compile a copy of my project on my local machine, I get an error stating that it 's skipping ... in question is 32-bit after all? 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 i estimate memory usage of std::map?

For example, I have a std::map with known sizeof(A) and sizeof(B), while map has N entries inside. How ... s easier to ask for upper bound? 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 std::string to std::vector<char>

I am using a library which accepts data as a vector of chars. I need to pass a string to the library. I ... json_str.begin(), json_str.end()); 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 aren't static const floats allowed?

I have a class which is essentially just holds a bunch of constant definitions used through my application. For ... Am I missing something? 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 I "unuse" a namespace?

One of the vagaries of my development system (Codegear C++Builder) is that some of the auto-generated headers ... ... unusing namespace xyzzy; 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 intersection of two sorted arrays

Given two sorted arrays: A and B. The size of array A is La and the size of array B is Lb ... difference for the intersection finding algorithm? 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 does this program crash: passing of std::string between DLLs

I have some trouble figuring out why the following crashes (MSVC9): //// the following compiles to A.dll ... shared_ptr with a custom deleter. 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++ - Automatically adding Enter/Exit Function Logs to a Project

I have a 3rd party source code that I have to investigate. I want to see in what order the functions are ... is called. What do you think? 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++ - Inheritance or composition: Rely on "is-a" and "has-a"?

When I design classes and have to choose between inheritance and composition, I usually use the rule of thumb: if ... always right? Thank you. 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 can't "transform(s.begin(),s.end(),s.begin(),tolower)" be complied successfully?

Given the code: #include <iostream> #include <cctype> #include <string> #include <algorithm> using namespace std; int ... , it no longer errors. 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++ - Generating m distinct random numbers in the range [0..n-1]

I have two methods of generating m distinct random numbers in the range [0..n-1] Method 1: //C ... mathematical expectation of the running time) 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 hide strings in a exe or a dll?

I discovered that it is possible to extract the hard-coded strings from a binary. For example the properties ... some obscure hidden input? 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++ - Thread safe implementation of circular buffer

Circular_buffer from boost library is not thread-safe. So I wrapped boost::circular_buffer object in a class as shown ... just cv::Mat object). 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 update a printed message in terminal without reprinting

I want to make a progress bar for my terminal application that would work something like: [XXXXXXX ] which would give ... all under linux, 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++ - Templated class specialization where template argument is a template

I wondering if something similar to this is possible. Basically, I have a templated class that occasionally takes ... Thanks for the 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++ - Returning to beginning of file after getline

So i've read all the lines from a file thusly while (getline(ifile,line)) { // logic } Where ifile is an ... back to the start of the file? 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 destructor is not called on exception?

I expected A::~A() to be called in this program, but it isn't: #include <iostream> struct A { ~A() ... ? What does standard say on this matter? 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 float values from big endian to little endian

Is it possible to convert floats from big to little endian? I have a big endian value from a PowerPC platform that ... ? What am I doing wrong? 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++ - friend AND inline method, what's the point ?

I see in a header that I didn't write myself the following: class MonitorObjectString: public MonitorObject { // ... Is the "friend" useless? 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 extract the source filename without path and suffix at compile time?

Using both gcc with -std=c11 and g++ with -std=c++14. E.g. for a file named src/dir/Hello.cxx it ... could place LOG_DEBUG(...) in its code. 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 return type of assignment operator?

I am just starting C++. I am a bit confused about the return type of assignment and dereference ... Any explanation would be 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++ - Check if a variable type is iterable?

Is there any way to check if an arbitrary variable type is iterable? So to check if it has indexed elements or I can ... how to do this 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++ - The implementation of std::forward

I'm reading Overview of the New C++ (C++11/14) (PDF only), at Slide 288 it gives an implementation ... ? Why is latter the usual implementation? 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 parameter packs access Nth type and Nth element

The following paper is the first proposal I found for template parameter packs. http://www.open-std.org/jtc1/ ... , what is their replacement? 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++ - Deprecated conversion from string literal to 'char*'

I have a program which declares an array of strings like this: char *colors[4] = {"red", "orange", " ... explain what the error means. 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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