Recent questions tagged C++

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I've been experimenting with constexpr. On my test compiler (g++ 4.6) this fails to compile with an error about out ... foo<fail()>::print(); } 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++ - Fastest way to Find a m x n submatrix in M X N matrix

I was thinking of a fast method to look for a submatrix m in a bigger mtrix M. I also need to identify ... is taken as partial match. 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++ - Forward Declaration of a Base Class

I'm trying to create proper header files which don't include too many other files to keep them clean and to ... How do I solve these problems? 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++ - Stripping all qualifiers from a function type

Given a possibly varargs function type with possibly a cv-qualifier-seq and possibly a ref-qualifier, is it possible ... functions. - end note ] 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 way to pass nested initializer lists in C++11 to construct a 2D matrix?

Imagine you have a simple matrix class template <typename T = double> class Matrix { T* data; size_t row, col; public: ... 18 19 22 20 23 21 24 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 it not possible to use private method in a lambda?

Having a class like this: class A { public: bool hasGrandChild() const; private: bool hasChild() const; vector<A> ... not work, but this works. 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++ - Check if one set of types is a subset of the other

How can one check if one parameter pack (interpreted as a set) is a subset of another one? So far I only ... the solution works with C++11. 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 the correct way to programmatically quit an MFC application?

Using windows MFC C++. I have a third party app that calls a user-defined method in my CWinApp derived class. ... to a control return TRUE; } 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++17 structured binding that also includes an existing variable

This SO answer lists some shortcomings of C++17 decomposition declarations (the feature formerly known as "structured ... doesn't work. :( 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++ - fastest way to convert a std::vector to another std::vector

What is the fastest way (if there is any other) to convert a std::vector from one datatype to another ... from one datatype to another? 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++ compile error: `.rodata' can not be used when making a shared object; recompile with -fPIC

I am using the command: g++ --std=c++11 -fPIC -Iincludes parser.cpp lib/main-parser.o lib/lib.a To ... to find any answers. Thanks in advance 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.Log - how to configure a text sink backend to append to rotated files

I have a sinks::text_file_backend sink. Say I already have a few rotated log files: myLog001.log, myLog002.log and ... be done in Boost.Log? 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 GCC Undefined Behavior Sanitizer

Today I have read an article about GCC Undefined Behavior Sanitizer (ubsan). However, when I follow steps there (add - ... | 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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c++ - "std::bad_alloc": am I using too much memory?

The message: terminate called after throwing an instance of 'std::bad_alloc' what(): std::bad_alloc I looked at ... that doesn't cause problems. 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++ - When do casts call the constructor of the new type?

What are the rules to determine whether or not a particular static_cast will call a class's constructor? How ... style/functional style casts? 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++ - MSbuild Error: The builds tools for v140 (Platform Toolset = 'v140') cannot be found

I have a solution which is consists of a large number of projects (C++ and C#). I upgraded the solution ... Any help would be very appreciated. 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 it necessary to use template parameters to refer to same class inside definition?

Is this necessary: template <typename T> class A{ T*point; A<T> someFunction(){} //instead of returning ... safe habit to omit the brackets. 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++ - Understanding the origin of a linker duplicate symbol error

I have a c++ program that compiled previously, but after mucking with the Jamfiles, the program no longer compiled and ... might I do 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++ - ifstream::is_open vs ifstream::fail?

Reading Savitch's Problem Solving in C++, std::ifstream::fail is shown as an example to check if a ... does it make no practical difference? 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++ - map.erase( map.end() )?

Consider: #include <map> int main() { std::map< int, int > m; m[ 0 ] = 0; m[ 1 ] = 1; m ... (100% CPU). Is it implementation dependent? 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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168 views

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c++ - Delete folder and all files/subdirectories

How can I delete a folder with all it's files/subdirectories (recursive deletion) 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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305 views

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c++ - What is the difference between std::condition_variable and std::condition_variable_any?

I'm probably missing something obvious, but I can't see any difference between std::condition_variable and std:: ... Why do we need both? 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++ - 'auto' as a template argument placeholder for a function parameter

C++20 allows using auto for function parameter type. Does it also allow using auto as a template argument ... for this template argument" 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 a reference have a storage location?

Does a reference have a storage location or is it just an alias for another location? Does this differ by C++ ... space or is it an alias? 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 FAR PASCAL?

I was wondering why in some source code there are these macros like FAR and PASCAL. What do they mean and 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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250 views

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c++ - What is the return type of a lambda expression if an item of a vector is returned?

Consider the following snippet: #include <iostream> #include <vector> #include <functional> int main() { std: ... , causing the 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++ - forward/strong enum in VS2010

At http://blogs.msdn.com/vcblog/archive/2010/04/06/c-0x-core-language-features-in-vc10-the-table.aspx there ... /wg21/docs/papers/2008/n2764.pdf See Question&Answers more detail:os...

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

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537 views

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c++ - Reading binary istream byte by byte

I was attempting to read a binary file byte by byte using an ifstream. I've used istream methods like get() ... ? MSVC++ 2008 on Windows. See Question&Answers more detail:os...

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

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