Recent questions tagged C++

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c++ - Get element from arbitrary index in set

I have a set of type set<int> and I want to get an iterator to someplace that is not the beginning. I am ... an iterator to where I want 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++ - Function template return type deduction

I have some class C with const and non-const getters for some generic type Node: template <typename NodeType> ... but have not been successful. 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++ - Adding Elements to std::vector of an abstract class

I want to store objects of classes derived from a common interface (abstract class) in a std::vector of that abstract ... [ii]; } 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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c++ - Is there any use for named parameters into template template parameters

If I need to define a template foo function with a template-template parameter, I usually do the following ... of template-template parameters. 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 there a special new and delete for arrays?

What is wrong with using delete instead of delete[]? Is there something special happening under the covers for ... from malloc and free? See Question&Answers more detail:os...

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

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198 views

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c++ - Extracting the return type from an overloaded function

I want to extract the return type of a function. Problem is, there are other functions with the same name but ... .g. resultof(f(int))? 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++ - Argument dependent name lookup and typedef

I would not have expected this code to compile, but it does. My understanding is that func(d) it looks in the ... { datatype d; func(d); } 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 include path

In a C++ project, I would to include the header files as as descendants of the project's source directory without use ... .h |-src | | foo.cpp 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++ - overloaded "operator++" returns a non const, and clang-tidy complains

I have just got the following warning from clang-tidy: overloaded "operator++" returns a non-constant object ... the postfix to be const? 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++ - Can std::is_invocable be emulated within C++11?

I'd like to use std::is_invocable, however we are using c++11 standard, while is_invocable is available only from c ... using c++11? Thank you 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 member variables list after the colon in a constructor good for?

I'm reading this C++ open source code and I came to a constructor but I don't get it ( basically ... of call them within the constructor 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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c++ - 0xc000007b Error?

here is some information to understand my situation better. OS: windows 8.1 IDE: Visual Studio 2008 Pro Language: C++ ... . How can i fix 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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c++ - Invalid explicitly-specified argument in clang but successful compilation in gcc — who's wrong?

The following code compiles without problems in g++: #include <iostream> #include <string> #include <tuple> ... passing it by reference? See Question&Answers more detail:os...

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

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444 views

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c++ - MinGW and std::thread

So I've been trying to get the following code to compile and run on Windows by using a MinGW compiler. ... someone out there can help me! See Question&Answers more detail:os...

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

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178 views

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c++ - bidirectional iterator over file/ifstream

I need an input file stream which would have a bidirectional iterator/adapter. Unfortunately std::ifstream (and ... Any ideas? Thank you! See Question&Answers more detail:os...

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

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332 views

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c++ - How come forward declaration is not needed for friend class concept?

I've just recently learned about friend class concept in C++ (I've googled around for a bit, but ... forward declaration was needed anywhere. See Question&Answers more detail:os...

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

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461 views

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c++ - emit std::string with qt signal

I am trying to emit standard string with qt signal. The signal will be delivered as queued. I registered the type ... ::string>("std::string") See Question&Answers more detail:os...

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

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164 views

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c++ - How do you get info for an arbitrary time zone in Windows?

Ideally, what I'd like to be able to do is take the name of a time zone and ask Windows for its ... zone info for an arbitrary time zone? See Question&Answers more detail:os...

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

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224 views

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c++ - Linux CreateProcess?

I developing on the Linux platform. I want to create a new proccess in my library without replacing the ... if the current process closed. 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++ - 'iostream' file not found error occur in xcode 4.5?

i m practising C++. i just add c++ files in XCode and write some string splitting functionality in it. ... but result is same. Thanks iHungry See Question&Answers more detail:os...

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

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87 views

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c++ - How to check dependencies of floats

I want to determine (in c++) if one float number is the multiplicative inverse of another float number. The ... right. why is this happening? See Question&Answers more detail:os...

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

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145 views

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c++ - How to define a recursive concept?

The cppreference.com states that: Concepts cannot recursively refer to themselves But how can we define a concept that ... N. Is it possible? See Question&Answers more detail:os...

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

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360 views

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c++ - Screen Capture Specific Window

Is it possible to screen capture a specific window (also possibly of another process)? Currently I am capturing ... regardless of its position). See Question&Answers more detail:os...

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

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486 views

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c++ - Custom Memory Allocator for STL map

This question is about construction of instances of custom allocator during insertion into a std::map. Here is a ... malloc(48) should work. 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 come a pointer to a derived class cannot be passed to a function expecting a reference to a pointer to the base class?

Sorry for the long title but I did want to be specific. I expected the following code to work but it doesn't and I ... ]) { Foo(); 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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324 views

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c++ - Return value or rvalue reference?

In Scott Meyer's new book, he proposes an example usage for rvalue reference qualifiers that looks something like ... sense conceptually to me. See Question&Answers more detail:os...

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

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165 views

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c++ - Why does the name of a source file affect compilation?

I came across something really weird when I wrote a little lotto program in C++ called "lotto.cpp". Everything was fine ... ]; } } return -1; } See Question&Answers more detail:os...

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

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227 views

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c++ - Are C++11 standard containers "final"?

We (should) know that C++ standard library containers, including std::string, are not meant to be inherited from. But ... ? If not, why is 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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