Recent questions tagged C++

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I wanted to compare a string without actually defining one of them as a string, something like this, if (string ... compare in a similar way? 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++ - 0xC0000005: Access violation reading location 0x00000000

I'm having a very strange issue with a space invaders game I'm working on. Basically I get an access violation error: ... (w), height(h) {}; 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 include the stdafx.h from the root directory?

With "Show all files" option on in VS, i added a folder and created a new class in that folder. Since i'm ... to go one directory level up ? 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 GCC not seem to have the filesystem standard library?

i'm facing a problem with filesystem library, it should be included in c++17 compiler, after 2 days i ... (like filesystem) correctly ?? 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 fread reaching the EOF early?

I am writing a C library that reads a file into memory. It skips the first 54 bytes of the file (header) and ... that it "shall have no effect". 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++ - Difference between &(*similarObject) and similarObject? Are they not same?

Can someone please explain this to me dynamic_cast<SomeObject *>( &(*similarObject) ); What is the point of doing ... be the address of it? 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++ - boost-program-options: notifier for options with no value

One can use notifier for parsed options only if they have value_semantic. What is the best way for no-value options ... as s given value to it. 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++ - Value-initializing an automatic object?

I'm writing a template class and at one point in my code would like to be able to value-initialize an object of the ... T(); as good as it gets? 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 `std::uniform_int_distribution<uint8_t>` and `std::uniform_int_distribution<int8_t>` Allowed?

As the documentation says: The effect is undefined if this is not one of short, int, long, long long, ... byte types provided just by 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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c++ - How to convert a TCHAR array to std::string?

How do I convert a TCHAR array to std::string (not to std::basic_string)? 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 the overhead cost of an empty vector?

What is the memory overhead of having an empty vector vs having a pointer to a vector? Option A: std::vector<int> ... the empty 'v' take up? 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 suppress specific warnings in g++

I want to suppress specific warnings from g++. I'm aware of the -Wno-XXX flag, but I'm looking for ... I have to write a wrapper script? 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++ cli - Implementing an interface declared in C# from C++/CLI

Say I have a C# interface called IMyInterface defined as follows: // C# code public interface IMyInterface { void ... (System::String^ value)' 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++ - Does insertion to STL map invalidate other existing iterator?

I used std::map in STL. Can I use iterator after some other element inserted to the map? Is it still valid? 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++ - Neatest way to loop over a range of integers

Since C++11 introduced the range-based for loop (range-based for in c++11), what is the neatest way to express ... in C++11: Generator 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++ - Why is std::move not [[nodiscard]] in C++20?

I've recently read about [[nodiscard]] in C++17, and as far as I understand it's a new feature (design by ... because C++20 isn't finalised yet? 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 debug segmentation fault?

It works when, in the loop, I set every element to 0 or to entry_count-1. It works when I set it up so that ... ? I am out of ideas to explore. 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++ - Register an object creator in object factory

I have the convenient object factory template that creates objects by their type id names. The implementation is pretty ... be OK with that. 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++ - TCP Winsock: accept multiple connections/clients

I tried to can multiply clients, and send it to each one. But it working only for one, after one client connected ... break; } } continue; } } 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++ - Send binary file over TCP/IP connection

I will rephrase the whole question here so that it is answerable. I am able to copy binary file perfectly in ... bytes sent by the server? 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++ - cudaMalloc of a structure and an element of same structure

I would like to know what happens on the device (memory wise) when I allocate a structure and then allocate(? ... and related to this 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++ - Boost Spirit x3: parse into structs

From the Boost Spirit X3 tutorial: First, let's create a struct representing an employee: namespace client { ... need to use semantic actions? 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 returning local static object thread safe for pre-c++11 compilers

Is this singleton thread safe for the pre-C++11 compilers ? As we know for C++11 it is thread safe. ... INSTANCE; return INSTANCE; } }; 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++ - Optimal buffer size for write(2)

Let's say I want to write a 1 GB of data to the file on, say ext3 Linux filesystem using write(2) ... get some answer from "filesystems" guys. 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++ - Initializer list syntax in member initializer list using C++11

I've been going through 'A Tour of C++' and Bjarne uses the the c++11 initializer list feature in member ... one be preferred over the other? 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 Tokenizer escaped_list_separator with different parameters

Hello i been trying to get a tokenizer to work using the boost library tokenizer class. I found this tutorial ... by peter thank's everybody. 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++ - Instantiating classes by name with factory pattern

Suppose I have a list of classes A, B, C, ... which all inherit from Base. I get the class name as a ... so I though I'd ask for suggestions. 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++ - Allowing access to private members

This question is somewhat a continuation of this one I've posted. What I was trying to do: my point was to ... the one from litb's 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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