Recent questions tagged C++

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I've been following Beej Networking guide and in the server section there is portion of code where it has called a ... endl; } return 0; } 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++ - Ramifications of C++20 requiring two's complement

C++20 will specify that signed integral types must use two's complement. This doesn't seem like a big ... two's complement mandate provides? 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++ - Reverse Contents in Array

I have an array of numbers that I am trying to reverse. I believe the function in my code is correct, but I cannot get ... << temp << " "; } } 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++ - Overloads of inherited member functions

Can a class overload methods that also exist in the publicly inherited interface? It seems like this is unambiguous and useful ... C(&A, &B); } 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++ - Creating a Gaussian Random Generator with a mean and standard deviation

I am trying to create a one dimensional array and use a random number generator(Gaussian generator that generates a ... doing 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++ - Non-const reference may only be bound to an lvalue

Could someone please explain how to simulate this error? and also what this complains about. "A non-const reference may ... an lvalue" 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 I'm supposed to use the sanitizer in clang?

I'm sorry if this is a uber-easy concept, but I find hard to acquire the right mindset in order to ... the point of that undefined symbol ? 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++ - Use std::vector::data after reserve

I have a std::vector on which I call reserve with a large value. Afterwards I retrieve data(). Since ... data to the allocated memory range? 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 a string literal be subscripted in a constant expression?

This is valid, because a constexpr expression is allowed to take the value of "a glvalue of literal type that refers to ... be new to C++11. 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 template instances not be deduced in `std::reference_wrapper`s?

Suppose I have some object of type T, and I want to put it into a reference wrapper: int a = 5, b = 7; ... ::less<T>() is a general solution. 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 the result of a cast an rvalue?

Let int a = 0; Then is (int)a an rvalue in standard C++? Different compilers show different results for ... 2) http://webcompiler.cloudapp.net/ 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++ - clang++ not accepting use of template template parameter when using CRTP

I'm getting compilation errors when trying to call the base class constructor in derived initialization list when using a ... than g++ of late! 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++ - Constructor-style casting in function call parameters

I don't understand why the following code fails to compile when using constructor-style casting: template<typename T ... answer the question ;) 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++ - Do I need to have 64 bit Processor to use 64 bit data type

I have a few questions: Do I need to have 64 bit Processor to use 64 bit data type(__int64 or int64_t) ? ... things going under the hood too? 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 we use a lambda-expression as the default value for a function argument?

Refering to the C++11 specification (5.1.2.13): A lambda-expression appearing in a default argument shall not implicitly ... { return x; }) { } 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++ - QObject connection function

I checked other similar questions and tried their solutions but they don't work for me. I'm basically trying to ... (QNetworkReply *)" Any idea? See Question&Answers more detail:os...

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

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242 views

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c++ - Is there any way to decompile Linux .so?

Is there any way to decompile Linux .so? 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 cppreference define type_traits xxx_v shortcuts as inline constexpr and not just constexpr?

Why does cppreference define type_traits xxx_v shortcuts as inline constexpr and not just constexpr? For example, see ... the standard, then. 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 an exception be thrown from the ternary operator?

Sometimes it is convenient or even necessary to have a function which just one statement (it is necessary when ... wrong with the above 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++ - Is it possible to pass cout or fout to a function?

I'm trying to find a way to pass fout or cout to a function. I realize there are logically easy ways to deal ... << "Hello World"; return; } 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++ - tr1::unordered_set union and intersection

How to do intersection and union for sets of the type tr1::unordered_set in c++? I can't find much reference ... from tr1. Thank you very much. See Question&Answers more detail:os...

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

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527 views

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c++ - Adding header and .cpp files in a project built with cmake

I have built a project using cmake and some libraries.I want however to add some header and .cpp files in the ... built using cmake I can't? 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 i cannot use the auto keyword in the last version of gcc

All, recently i tried to use the new features supported by c++11, and i wrote such statement however the ... know the reason for this issue? See Question&Answers more detail:os...

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

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453 views

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c++ - How to use lock_guard when returning protected data

I have a question concerning the use of boost::lock_guard (or similar scoped locks) and using variables that should ... mData; } return ret; } 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++ - Range-based for with brace-initializer over non-const values?

I am trying to iterate over a number of std::lists, sorting each of them. This is the naive approach: ... which is my current workaround). 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++ - Variables optimized out with g++ and the -Og option

When I compile my C++ program with g++ using the -Og option I see variables that are <optimized out>, and also the ... .2 and gdb version 7.7.1. 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++ - Qt: meaning of slot return value?

According to the documentation the return value from a slot doesn't mean anything. Yet in the generated moc code I see ... 0]) = _r; } break; 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++ - CMake install (TARGETS in subdirectories)

Consider the following CMakeLists.txt file: add_subdirectory(execA) add_subdirectory(libB) install(TARGETS execA libB ... fix this error? See Question&Answers more detail:os...

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

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