Recent questions tagged C++

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c++ - Select an integer type based on template integer parameter

I would like to create a class template which takes an unsigned integer parameter and has a member u_ whose ... How would you implement 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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c++ - Turning temporary stringstream to c_str() in single statement

Consider the following function: void f(const char* str); Suppose I want to generate a string using stringstream ... this function as expected? 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 write to stdout from an MFC program?

MFC programs can't normally write to stdout. MFC does something weird with the stdout/stdin pipes during ... program? Thanks for reading. 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++ - Printing to the console vs writing to a file (speed)

In C++, which would be faster if repeated, say, 5000 times: cout << "text!" << endl; or my_text_file << "text ... 40 ms with endl and 4 ms with 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++ - Building static libraries on Mac using CMake and GCC?

Greetings all, I have a static library which I later link with my application. My development environment is CMake, ... and it worked fine!! 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++ - Double (two-dimensional) array using std::unique_ptr

I have a double array allocated by pointer to pointer. // pointer to pointer int **x = new int *[5]; / ... operands. What I am doing wrong here? 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++ - GoogleTest 1.6 with Cygwin 1.7 compile error: 'fileno' was not declared in this scope

GoogleTest 1.6 with Cygwin 1.7: 'fileno' was not declared in this scope Error message when building a simple test ... (40320, Factorial(8)); } 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++ - Difference between static const char* and const char*

Could someone please explain the difference in how the 2 snippets of code are handled below? They definitely compile to ... "hello" ); } }; 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++ - Efficient way to compute p^q (exponentiation), where q is an integer

What is an efficient way to compute pq, where q is an integer? 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 gracefully shutdown a boost asio ssl client?

The client does some ssl::stream<tcp_socket>::async_read_some()/ssl::stream<tcp_socket>::async_write() calls and at ... client with boost asio. 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++ cli - IntelliSense: "#using" requires C++/CLI to be enabled

#using <mscorlib.dll> #using <System.dll> using namespace System; using namespace System::Text; using namespace System:: ... to fix this prob!? 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++ - Emscripten - cmake - pass emscripten options in CMakeList file

How to use emcmake cmake and pass emscripten command-line options? Pretty new to c++ / CMake, but can't ... the CMakeList file? Many 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++ - Creating your own HRESULT?

I already have a project that uses a lot of COM, and HRESULTS. Anyways I was wondering if it's possible ... already uses COM throughout 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++ - include string or string.h

To use memset(), what is the difference between #include <string> //did not work and #include <string.h> //worked 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++ - Replacement for MS _vscprintf on MacOS/Linux?

As a learning experience I'm porting some stuff from Windows to MacOS and came across something like this: void ... on MacOS/Linux? 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 doesn't explicit bool() conversion happen in contextual conversion

If the following test-programm #include <iostream> class A { public: A() {} explicit operator bool() const { ... over converting to const-bool? 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++ - template instantiation with constexpr function failure

I have template class C that has a non-type but reference template parameter to a type P: class P { public: ... from a native reference, or ? 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 use enums in Qt signals and slots

I have some trouble with using enum types in signals. Basicly I have two classes, a state machine and a thread handling ... is:" << newState; } 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++ - Array bounds checks on 64-bit hardware using hardware memory-protection

I was reading a blog on 64-bit Firefox edition on hacks.mozilla.org. The author states: For asm.js code, ... bit hardware aids in bounds check? 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++ - Static member variable in template, with multiple dlls

My code is built to multiple .dll files, and I have a template class that has a static member variable. I ... variable in the both of them. 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 force template <class> to be derived from BaseClassA?

Is there any possibility to force a template to be from a certain base class so that I can call the base class ... //... do other stuff } 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 can I create a new primitive type using C++11 style strong typedefs?

I'm trying to emulate in C++ a distinct type from the Nim programming language. The following example won' ... Bjarne was trying to demonstrate? 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++ - Should this compile? Overload resolution and implicit conversions

This example seems to compile with VC10 and gcc (though my version of gcc is very old). EDIT: R. ... to compile with similar ambiguous error. 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++ cli - Convert an IntPtr window handle to IWin32Window^

How do I convert a handle acquired from a form/control's Handle property, to a IWin32Window^ ? 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 prevent an implicit cast double -> int?

Question as above, more details below: I have a class Money to deal with... well, you guessed what. I am ... to his answer). Again, 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++ - Does an expression with undefined behaviour that is never actually executed make a program erroneous?

In many discussions about undefined behavior (UB), the point of view has been put forward that in the ... represent opposite points of view See Question&Answers more detail:os...

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

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329 views

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c++ - Add library search path to clang

How can I add /usr/local/lib to my clang library search path? This is what I see when I list my library search paths using clang -Xlinker -v: 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++ - optimized memcpy

Are there faster alternatives to memcpy() in C++? See Question&Answers more detail:os...

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

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