Recent questions tagged C++

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c++ - Nested function calls order of evaluation

It's well-known that the order of evaluation of a function's arguments in unspecified and can differ between ... confirmation in the Standard. 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 dereferencing a pointer that's equal to nullptr undefined behavior by the standard?

An blog author has brought up the discussion about null pointer dereferecing: http://www.viva64.com/en/b/0306/ ... the value of null pointers? 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 std::streampos guaranteed to be unsigned long long?

Is std::streampos guaranteed to be unsigned long long? If not so, how does std::istream::seekg work correctly on files larger than 4G? 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 one access the template parameter outside of a template without a typedef?

A simple example: template<typename _X> // this template parameter should be usable outside! struct Small { typedef ... in the Small class? 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++ - Which std types are guaranteed to be empty/null after being used as arg in move constructor

I know shared_ptr, unique_ptr, weak_ptr are guaranteed to be empty after used as RVR argument in the constructor ... types state is specified. 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 are some functions within my template class not getting compiled?

I am using VS Express 2013 trying to compile a c++ project. I've created a template class with some ... I've added that information in. 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 generate godbolt like clean assembly locally?

I want to generate clean assembly like Compiler Explorer locally. Note that, I read How to remove noise ... any unused labels or directives? 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++ - std::hash template partial specialization

I wrote some class with template: template <class T, class Allocator = ::std::allocator<T> > class my_list; I ... class template. What can I do? 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++ - Using of rvalue references in c++11

I would like to implement a function that fills up a vector and then returns an rvalue reference. I tired ... get rvalue references just yet. 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++ - SDL2 on Raspberry Pi without X?

I'm hoping to develop some code that uses SDL2 to display graphics on the 7" RPi touchscreen, but I'd rather ... SDL_Quit(); 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++ - Change default CMakeLists.txt in CLion to include warnings

In CLion the default CMakeLists.txt sets the C++11 compiler flag only. I'd like to have warnings and the ... CMakeLists.txt template in CLion? 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++ - boost serialization std::unique_ptr support

Does the boost serialization library support serialization of std::unique_ptr? I tried to compile the code below, but if I ... g; } 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++ - Why does this double to int conversion not work?

I've been thoroughly searching for a proper explanation of why this is happening, but still don't really ... 'm not understanding. 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++ - g++ 4.6.1 compiler error: Error: unknown pseudo-op: `.cfi_personality'

I have a file which compiles without errors or warnings on my macbook pro running osx (snow leopard) using g+ ... unknown pseudo-op: `.cfi_lsda' 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++ - GCC: program doesn't work with compilation option -O3

I'm writing a C++ program that doesn't work (I get a segmentation fault) when I compile it with ... combination of values each vector has. 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++ - Automatically call function when variable changes

Is there a way in c++ to automatically call a function when a variable's value changes? 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++ - Does `decltype` give me an object's static type, or its runtime type?

[C++11: 7.1.6.2/4]: The type denoted by decltype(e) is defined as follows: if e is an unparenthesized ... its runtime type, or its static 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++ - what is auto_ptr_ref, what it achieves and how it achieves it

auto_ptr_ref documentation here says this This is an instrumental class to allow certain conversions that allow auto_ptr ... and its internals 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++ - Redirect cin to a string

I want to have cin read input from a string. Is there a way to have it do this? Something like this: const char * s ... ; cin>>i; cout<<i; //123 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++ - Concatenate boost::dynamic_bitset or std::bitset

what is the best way to concatenate 2 bitsets? For example i've got boost::dynamic_bitset<> test1( std:: ... better way please contact 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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c++ - Run Linux commands from Qt4

How can I run command-line programs under Linux from Qt4? And of course I want to obtain the output in some ... to know for any future issues. 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++ - std::endl crashes Windows 8, compiled using MinGW

I have 3 computers, two of which use Windows 8. Using the latest version of MinGW's g++ (4 ... instruction. 0x00405065 in _Jv_RegisterClasses () 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 accumulate faster than a simple for cycle?

I was testing algorithms and run into this weird behavior, when std::accumulate is faster than a simple for cycle. ... << endl; 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++ - Custom inserter for std::copy

Given a std::vector which holds objects of MyClass. How can I create another vector which holds just data of one ... ? std::vector<int> vec2; 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++ - win32 api function to get processor's current speed

I am unaware of a win32 api function/functions used to query the local PC processor's current speed. I wish not ... to be feasible on all PCs. 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++ - Declaring abstract class (pure virtual method) increase binary size substantially

Here is the story: I am developing C++ software for ARM Cortex-M0 processor in Linux with AC6 Toolpack. Before ... track the links in answers. 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 get the dimensions (resolution) of each display?

I need help on how to retrieve the resolutions of my screens, as shown in the image below. I found ... information about the other monitors? 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++ - Boost Serialization using polymorphic archives

I am working on a client-server application that uses boost::serialization library for it's serialization needs. I need ... < endl; 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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