Recent questions tagged C++

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Following the discussion from this post, I have understood that the main reason for the alignment of structure ... } structc_t; Thank you 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 find a search term in source code

I'm looking for a way to search for a given term in a project's C/C++ code, while ignoring any ... better way to search only payload code. 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 do unsigned integers work

As the title suggests, I am curious about how an unsigned int (or things like NSUInteger, u_int_blah, but I ... ? Does it overflow? Thankyou 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++ - std::thread is not a member of namespace std using Eclipse Kepler MinGW

I'm trying to compile a simple c++ program that uses std::thread on eclipse kepler / mingw 4.8.1 ... missing to get this compiling 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++ - What is a reference-to-pointer?

I recently saw a function that is being declared as: void func(type* &param); I already know the difference ... it advisable to do this? 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++ - Cyclic dependency between header files

I'm trying to implement a tree-like structure with two classes: Tree and Node. The problem is that from each ... too. Thanks, problem solved. 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++ - Force all classes to implement / override a 'pure virtual' method in multi-level inheritance hierarchy

In C++ why the pure virtual method mandates its compulsory overriding only to its immediate children (for object ... this effect 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++ - Get index of a tuple element's type?

If I have a tuple with different element types like std::tuple<T0, T1, T2, ...> And how to get the index of a ... enum {value = ?;} }; 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++ - How do I store arrays in an STL list?

Using C++ and the STL, does anybody know how to store integer arrays as nodes in an STL list or vector? I ... just missing a * or & somewhere? 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 make G++ preprocessor output a newline in a macro?

Is there a way in gcc/g++ 4.* to write a macro that expands into several lines? The following code: #define ... need a macro expanding into X Y 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 release pointer from boost::shared_ptr?

Can boost::shared_ptr release the stored pointer without deleting it? I can see no release function exists in the ... t say use auto_ptr :) 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++ custom compare function for std::sort()

I want to create custom compare function for std::sort(), to sort some key-value pairs std::pair Here is my ... *'" . What is a mistake? 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 lifetime of temporary doesn't extend till lifetime of enclosing object?

I know that a temporary cannot be bound to a non-const reference, but it can be bound to const reference. ... +03) talks about this behavior? 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 can I use something like std::vector<std::mutex>?

I have a large, but potentially varying, number of objects which are concurrently written into. I want to protect that ... ,2,4) should I use? 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++ - Passing const char* as template argument

Why can't you pass literal strings in here? I made it work with a very slight workaround. template<const char* ptr> ... ); std::cin.get(); } 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 do I make a portable isnan/isinf function

I've been using isinf, isnan functions on Linux platforms which worked perfectly. But this didn't work on OS-X, so I ... )/log(a)); return 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++ - Using export keyword with templates

As i Understand "export" keyword can be used so that one can expose template classes or function signatures ... code implementing 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 do I replace all instances of a string with another string?

I found this on another stack question: //http://stackoverflow.com/questions/3418231/c-replace-part-of-a-string-with ... in the final result. = 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++ - Reverse map lookup

I have a 1 to 1 map. What's the best way to find keys from values, i.e. For examples if the map is ... key corresponding to 3 is C. 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++ - Easiest way to rotate by 90 degrees an image using OpenCV?

What is the best way (in c/c++) to rotate an IplImage/cv::Mat by 90 degrees? I would assume that there ... than that in the API and online. 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++ - std::put_time implementation status in GCC?

I was trying to compile this example program using GCC (tested versions 4.5.1, 4.6.3, 4.8.4): ... the implementation status for this library? 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++ - std::ignore with structured bindings?

Prelude: std::tuple<int, int, int> f(); std::tuple<int, int, float, int> g(); C++1z will ... structured bindings syntax? How would it work? 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++ - Correctly reading a utf-16 text file into a string without external libraries?

I've been using StackOverflow since the beginning, and have on occasion been tempted to post questions, but I've ... mode for it to work. 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 alloc a executable memory buffer?

I would like to alloc a buffer that I can execute on Win32 but I have an exception in visual studio cuz the ... Does somemone can help me? JS 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 it not good to use recursive inheritance for std::tuple implementations?

In this question, Howard Hinnant said Some implementations of std::tuple use recursive inheritance. But the good ones ... some light on 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++ - When is a type in c++11 allowed to be memcpyed?

My question is the following: If I want to copy a class type, memcpy can do it very fast. This is ... memcpy in any situation but incorrectly. 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 doesn't std::string provide implicit conversion to char*?

std::string provides const char* c_str ( ) const which: Get C string equivalent Generates a null-terminated sequence ... {return c_str();}? 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++ - So why is i = ++i + 1 well-defined in C++11?

I've seen the other similar questions and read the defect about it. But I still don't get it. Why is i ... anything? What have I gotten wrong? See Question&Answers more detail:os...

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

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