Recent questions tagged C++

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c++ - stringstream->rdbuf()->pubsetbuf is not setting the buffer

I am trying to modify a stringbuffer of a stringstream object without having to copy a string, using the method ... Update: I'm using VS2010 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 a really working example which showing the benefits of ILP(Instruction-Level Parallelism) on x86_64?

As known CPU is pipeline, and it works most efficiently if the sequence of commands independent from each other ... jne main+90h (013FFC1090h) 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++ - vector.push_back rvalue and copy-elision

I push_back a temporary object into a vector like this, vector<A> vec; vec.push_back(A("abc")); will ... pushing the temporary object into vec. 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++ - Travis CI with C++14 and Linux

Similar: Travis CI with Clang 3.4 and C++11 How does one get Travis CI to work with C++14? Here is our ... It works on osx, but not linux. 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++ - Placement new breaks consts and references?

Following the discussion on my answer to this question, apparently: the following code is allowed struct Foo { int ... /placement-new be exempt? 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 create a directory from a path

what is a convenient way to create a directory when a path like this is given: "serverfooar" note that the ... windows, MSVC compiler. 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++ - How do I strongly typedef non-primitive types?

Observe the following program in which a function accepts both the expected type and any type that is a ... similar to boost strong_typef? 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++ - Aggregate ‘BIGNUM foo’ has incomplete type and cannot be defined

I tried to compile opendcp, but error occurred. $ make ... [ 10%] Building CXX object libasdcp/CMakeFiles/opendcp- ... t know how to fix 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++ - decltype in class method declaration: error when used before "referenced" member is declared

Consider the following code: struct test { auto func() -> decltype(data) {} // ERROR int data; }; ... that would preserve my coding convention. 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++ - Having trouble passing multiple initializer lists to variadic function template

I don't understand the error message when trying to pass a variable number of initializer lists: template<typename... ... I want? [ideone link] 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 determine if the current window is the active window?

How can I tell if my window is the current active window? My current guess is to do GetForegroundWindow and compare ... using Win32 API / MFC. See Question&Answers more detail:os...

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

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679 views

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c++ - ostream showbase does not show "0x" for zero value

PSPS: (a Pre-scripted Post-script) It has just come to mind that a more prescient question would have ... h 0xffffffff I want 0xffffffff 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++ - C++0x thread static linking problem

I am having some issues trying to statically link programs using c++0x thread features. Code looks this: (Compiler ... /2005/06/static-libstdc/) 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++ - swprintf and vswprintf not declared?

I am trying to compile Botan on Windows with MinGW, and am receiving the following error during compilation: c:qt2010. ... 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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812 views

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c++ - typeid for polymorphic types

I expected this code to print 'Same 1' and 'Same2', but it prints only 'Same1': #include <iostream> #include < ... What and where is the catch? See Question&Answers more detail:os...

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

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985 views

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c++ - What std::_lockit does?

I checked performance of c++ project and results are not so clear to me. std::_lockit::int() has over 20% ... a hope that these are connected. See Question&Answers more detail:os...

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

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591 views

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c++ - Using freopen() to print to file and screen

I am trying to use freopen() to print to a text file and the screen, but I am only achieving the printing to a ... } cin.get(); 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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824 views

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c++ - Checking if a type is a map

I sometimes find the need to write general routines that can be applied to a container of objects, or a map of ... way to do this tag dispatch? See Question&Answers more detail:os...

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

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697 views

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c++ - Why "override" is at the end in C++11?

I'm trying to see the reason why, in C++11, they had to add the override keyword at the end of the ... of virtual when it was needed? 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++ - Why is Visual Studio 2013 having trouble with this class member decltype?

#include <vector> struct C { std::vector<int> v; decltype(v.begin()) begin() { return v.begin(); } ... '.begin' must have class/struct/union See Question&Answers more detail:os...

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

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730 views

1 answer

c++ - How to correctly create std::string from a std::string_view?

I have a class: class Symbol_t { public: Symbol_t( const char* rawName ) { memcpy( m_V, rawName, 6 * ... Any hints will be appreciated! 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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762 views

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c++ - Where do pixel gaps come from in OpenGL?

The problem that I have is, that there are some pixles in my rendered scene that seem to be missing/ ... meshing due to performance aspects. See Question&Answers more detail:os...

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

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705 views

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c++ - Non-member conversion functions; Casting different types, e.g. DirectX vector to OpenGL vector

I am currently working on a game "engine" that needs to move values between a 3D engine, a physics engine and ... must be a non-static member) 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++ - Initialize an std::array of tuples with curly braces

This probably has a very simple answer, but I really can't figure it out. Why do I get errors for doing this? ... std::tuple<int, 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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725 views

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c++ - Operator << overloading

I'm working on my project and I want to overload operator << which should print out my object on console. ... And line or column isnt 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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748 views

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c++ - wxWidgets 2.9 custom events

I appear to have followed this example (found under "Defining Your Own Event Class"), and my code compiles and ... the same as this question. See Question&Answers more detail:os...

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

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739 views

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c++ - HPET's frequency vs CPU frequency for measuring time

I need to measure function execution time in nanoseconds. Now I want to understand if my computer can do ... frequency is essential and why? See Question&Answers more detail:os...

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

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572 views

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c++ - Ortho and Persp are reversing Z depth sign?

NDC coordinates for OpenGL form a cube, who's -Z side presses against the screen while it's +Z side is ... farthest facing side. Why is 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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