Recent questions tagged C++

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I want to compile C++ code on MacOS X, using the g++ compiler. How do I install 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++ - Why is char[][] = {{...}, {...}} not possible if explicitly given a multidimensional array?

I went through this article. I understand the rules explained but I am wondering what exactly blocks the compiler ... What am I missing here? 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 C++11 compilers turn local variables into rvalues when they can during code optimization?

Sometimes it's wise to split complicated or long expressions into multiple steps, for example (the 2nd version ... this matter. Thanks, Michal 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 get the precision of high_resolution_clock?

C++11 defines high_resolution_clock and it has the member types period and rep. But I can not figure out how I can get ... */ << " nanos "; } 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++ - macro and member function conflict

I have problem that,std::numeric_limits::min() conflicts with the "min" macro defined in "windef.h". Is there ... macros? Thank you in advance. 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 set background color of window after I have registered it?

I am not using a dialog, I'm using my own custom class which I have registered and then used the CreateWindow ... they don't work. Any 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++ - Why is my class non default-constructible?

I have those classes: #include <type_traits> template <typename T> class A { public: static_assert(std:: ... Clang 9.0.0. 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++ - What is special about the executables compiled with Visual Studio 11 which results in that the executables cannot be executed on Windows XP?

I compile my C++ source code with Visual Studio 11 Developer Preview. I statically link to the runtime ... special within the executable? 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++ - Has a std::byte pointer the same aliasing implications as char*?

C++ (and C) strict aliasing rules include that a char* and unsigned char* may alias any other pointer. AFAIK ... and is not an arithmetic type. 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++ - Conversion from 'myItem*' to non-scalar type 'myItem' requested

I have this C++ code: #include <iostream> using namespace std; struct MyItem { int value; MyItem* nextItem; }; ... And what's going on here? 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 static_assert to check types passed to macro

I unfortunately have several macros left over from the original version of my library that employed some pretty ... question remains the same. 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 use the Windows API in MinGW?

How to use the Windows API in MinGW? 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++ - Contiguous iterator detection

C++17 introduced the concept of ContiguousIterator http://en.cppreference.com/w/cpp/iterator. However it doesn ... /w/cpp/iterator/iterator_tags 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++ - Unresolved externals despite linking in zlib.lib

I've been trying to compile an application which utilizes zlib compression in VC++ 2010. I get the error ... C:Program FilesMicrosoft Visual Studio 10.0VClibzlib.lib: 1> Searchi...

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

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c++ - Get local IP address in Qt

Is there a cross-platform way to get the local IP address (i.e. something that looks like 192.168.1.49) ... the FTP client should connect to. 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++ - const member and assignment operator. How to avoid the undefined behavior?

I answered the question about std::vector of objects and const-correctness, and received a comment about undefined ... a solution without UB? 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++ - Cannot open Windows.h in Microsoft Visual Studio

First of all: I'm using Microsoft Visual Studio 2012 I am a C#/Java developer and I am now trying to ... //// #endif // not APSTUDIO_INVOKED 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 work: returning C string literal from std::string function and calling c_str()

We recently had a lecture in college where our professor told us about different things to be careful about when ... what you think. 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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c++ - Getting array from std:vector

What is the easiest way of getting a char array from a vector? The way I am doing is getting a string ... . Are there other efficient methods? 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 as a function try block - Exception aborts program

I am not sure if this is a issue with the compiler or if I am doing something wrong. I am using Visual ... if I am doing something wrong here? 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++ - GCC 7, -Wimplicit-fallthrough warnings, and portable way to clear them?

We are catching warnings from GCC 7 for implicit fall through in a switch statement. Previously, we cleared them under ... so, then what is 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++ - unordered_map constructor error (equal_to templated function)

I thought I could have a pointer to a fully-specialized template function, but the following code isn't compiling ( ... std::equal_to<_Ty> &' 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++ - Compiling OpenCV code on a 64-bit mac

I recently inherited some OpenCV code. I installed openCV on my mac, built in in XCode, and then compiled ... , everything compiles just fine. 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++ - Dijkstra graph with a table of weights on each edge

I have a boost graph with multiples weights for each edges (imagine one set of weights per hour of the day) ... of not using a pointer function. 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 Console (/SUBSYSTEM:CONSOLE) and Windows (/SUBSYSTEM:WINDOWS)

can somebody please explain difference between those two declarations in the properties of the linker in visual studio ... to show an 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++ - How to debug C++11 code with unique_ptr in DDD (or gdb)?

std::unique_ptr are nice, but I find them less comfortable when debugging in DDD or gdb. I'm using ... : print pTest._M_t->_M_head_impl 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 Visitor Pattern avoid downcasting

can anyone show example code before and after to avoid down casting for visitor pattern code ? 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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c++ - STL MAP should use find() or [n] identifier to find element in map?

I am confused which is more efficient? As we can access map directly, why do we need to use find? I just need to ... 0; } thanks in advance! :) See Question&Answers more detail:os...

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

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