Recent questions tagged C++

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c++ - How Switch case Statement Implemented or works internally?

I read somewhere that the switch statement uses "Binary Search" or some sorting techniques to exactly choose the ... post as a question. 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++ - valgrind memory leak errors when using pthread_create

I'm writing a program using the pthread library. When I run my program with the command valgrind --leak-check= ... , what could be the problem? 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 find the current system timezone?

On Linux, I need to find the currently configured timezone as an Olson location. I want my (C or C++) code ... as an Olson location, on Linux? 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 does the void() in decltype(void()) mean exactly?

This is a follow-up of this question, more precisely of the comments of this answer. What does the void() ... type, an expression or whatever? 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++ - Ternary conditional and assignment operator precedence

I'm confused about direct assignment and ternary conditional operators precedence: #include<stdio.h> int main(void) { int ... 3-4ubuntu5) 4.4.3 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 overloaded function type>

In my class called Mat, I want to have a function which takes another function as a parameter. Right now I have ... work } Why does this happen? 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 computer does floating point arithmetic?

I have seen long articles explaining how floating point numbers can be stored and how the arithmetic of those numbers ... It is enough for me. 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 encoding does std::string.c_str() use?

I am trying to convert a C++ std::string to UTF-8 or std::wstring without losing information (consider ... wstring in a cross-platform fashion? 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 "operator void" not invoked with cast syntax?

While playing with this answer by user GMan I crafted the following snippet (compiled with Visual C++ 9): ... invoked with the cast syntax? 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 atomically update a maximum value?

In serial code, updating a maximum could be accomplished simply by template<typename T> void update_maximum(T& maximum_value ... ::atomic<T>). 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++ - Is there a portable equivalent to DebugBreak()/__debugbreak?

In MSVC, DebugBreak() or __debugbreak cause a debugger to break. On x86 it is equivalent to writing "_asm int ... or something into the 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++ - SetJmp/LongJmp: Why is this throwing a segfault?

The following code summarizes the problem I have at the moment. My current execution flow is as follows and a ... frames or something. 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++ - Get function names from call stack

I am working on an Android program which calls in to native code. That native code is segfaulting, and since ... 504 terminated by signal (11) 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 declare an array of objects whose class has no default constructor?

If a class has only one constructor with one parameter, how to declare an array? I know that vector is ... which contains 10000 Foo objects? 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++ - Critique my non-intrusive heap debugger

This is a follow-up to Critique my heap debugger from yesterday. As suggested by bitc, I now keep metadata about ... not released, hence leak } 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++ - Can std::begin work with array parameters and if so, how?

I have trouble using std::begin() and std::end() (from the iterator library) with c-style array ... iterator functions on array parameters? See Question&Answers more detail:os...

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

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583 views

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c++ - Compiling a Win32 GUI app (without a console) using MinGW and Eclipse

I'm using the eclipse IDE with MinGW as my compiler, to make a Win32 GUI app. I want to get rid of the ... effect. What am I doing 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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c++ - Intercept windows open file

I'm trying to make a small program that could intercept the open process of a file. The purpose is when ... network packets. Thanks for reading. 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 build Google's protobuf in Windows using MinGW?

I'm using Codeblocks as my IDE with MingGW. I'm trying to use google protocol buffers, but I'm having ... build protobuf using MinGW on Windows? 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++ - ‘cout’ does not name a type

I was learning Adam Drozdek's book "Data Structures and Algorithms in C++", well, I typed the code in page ... . Any help would be appreciated:) 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, really, deleting an incomplete type is undefined behaviour?

Consider this classic example used to explain what not to do with forward declarations: //in Handle.h file ... the rationale behind 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++ - std::function fails to distinguish overloaded functions

I am trying to understand why std::function is not able to distinguish between overloaded functions. #include < ... passed to std::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++ - New (std::nothrow) vs. New within a try/catch block

I did some research after learning new, unlike malloc() which I am used to, does not return NULL for ... -facto c++ programming convention. See Question&Answers more detail:os...

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

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216 views

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c++ - How to make template rvalue reference parameter ONLY bind to rvalue reference?

I'm writing a network library and use move semantics heavily to handle ownership for file descriptors. One of ... bind to rvalue reference? 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 the scope of a 'while' and 'for' loop?

What is the scope of a while and for loop? For example, if I declared an object within the loop, what is its behavior and why? See Question&Answers more detail:os...

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

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272 views

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c++ - Does casting to an int after std::floor guarantee the right result?

I'd like a floor function with the syntax int floor(double x); but std::floor returns a double. Is static_cast ... a double in the first place? 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++ - initializing std::string from char* without copy

I have a situation where I need to process large (many GB's) amounts of data as such: build a large ... can I re-use thisallocated space. 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's the point of a final virtual function?

Wikipedia has the following example on the C++11 final modifier: struct Base2 { virtual void f() final; }; struct ... or is there more to 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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