Recent questions tagged c++

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In a C++ Linux app, what is the simplest way to get the functionality that the Interlocked functions on Win32 ... add 32 or 64 bit integers? 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++ - Sorting an STL vector on two values

How do I sort an STL vector based on two different comparison criterias? The default sort() function only takes a single sorter object. 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 call destroy on a std::coroutine_handle?

The std::coroutine_handle is an important part of the new coroutines of C++20. Generators for example ... destructor of std::coroutine_handle. 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++ - gdb | view the variable argument list

I as using the bt command to view the stacktrace. The output is (gdb) bt #0 0x001ae4cd in Debugger (message= ... the variable argument list */ ? 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 a vector that holds two different data types or classes

I am trying to create a vector that holds an int and a string. Is this possible? For example I want vector< ... hold string x= "Picture 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++ - Getting a handle to the process's main thread

I have created an additional thread in some small testing app and want to suspend the main thread from this ... running in my additional thread. 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 Shifting more than 32 bits of a uint64_t integer on an x86 machine Undefined Behavior?

Learning the hard way, I tried to left shift a long long and uint64_t to more than 32 bits on an x86 ... x86 machine is an Undefined Behavior? 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++ - Limit floating point precision?

Is there a way to round floating points to 2 points? E.g.: 3576.7675745342556 becomes 3576.76. 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 safe to change a function pointer (std::function) inside a called function?

I have a std::function pointing to a function. Inside this function I change the pointer to another function. std:: ... 't see anything so far). 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 class diagram from source code using either Enterprise Architect or Rational Software Architect?

I am not fluent in UML, but I would like to create a class diagram based on existing C++ code. Other ... programs available for this purpose). 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 free(p) set p to NULL?

Any reasons why this can not be standard behavior of free()? multiple pointers pointing to the same object: #include ... to void*& (reference) 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 macro with string fails on VC 2015

Why does this fail to compile? char programDate[] = "("__DATE__")"; But this compiles fine (see space): ... 'operator ""__DATE__' not found 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 set compile flag /bigobj in visual studio?

I have a cpp file that contains a huge array. I get a fatal error (exceeded object file format limit) and ... set this flag in visual studio? 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++ - Long long int on 32 bit machines

very simple question, I read that GCC supports long long int type. But how can make math operations with it, when CPU is 32 bit wide only? 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 does "std::cout << std::endl;" compile?

Most IO stream manipulators are regular functions with the following signature: std::ios_base& func( std::ios_base& ... an overloaded function? 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 an int() Called?

It's been rehashed over and over that primitive types don't have constructors. For example this _bar is not ... .8.1 yields: 134514651 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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c++ - stdcall name mangling using extern c and dllexport vs module definitions (msvc++)

I was trying to export a simple test function for a dll to work with an application (fyi: mIRC) that ... about the two methods. 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++ - Random element from unordered_set in O(1)

I've seen people mention that a random element can be grabbed from an unordered_set in O(1) time. I attempted to do ... , this is in VC++ 2010. 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++ - A replacement for std::bind2nd

I have a foo which is a std::vector<int>. It represents the "edge" values for a set of ranges. For example, ... t "drop in" in the obvious way. 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 comes first - stack unwinding or copying of return values

Is the mutex used in method GetValues() released before or after copy constructing the dummy instance? class ... provided with boost lib. 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++ - Can multiple threads access a vector at different places?

Lets say I have a vector of int which I've prefilled with 100 elements with a value of 0. Then I create ... best way of achieving this? 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++ - In the member initializer list, can I create a reference to a member variable not in the list?

Consider: #include <string> #include <iostream> class Foo { public: Foo( char const * msg ) : x( y ) { y ... clarify what I am talking about.) 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 lambda, how can I pass as a parameter?

Please look at the following C++0x lambda related code: typedef uint64_t (*WEIGHT_FUNC)(void* param); typedef std:: ... What type should it be? 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++ - Print integer with thousands and millions separator

Got a question about printing Integers with thousands/millions separator. I got a Textfile where i got Country, ... ? Many 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++ - How to initialize char array using hex numbers?

I use utf8 and have to save a constant in a char array: const char s[] = {0xE2,0x82,0xAC, 0}; // ... there any other proper way of doing 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++ - Unexpected collision with std::hash

I know hashing infinite number of string into 32b int must generate collision, but I expect from hashing function some ... I somehow "seed" 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++ - Why can't concept refinement use the terse syntax

When refining concepts, the way it is consistently done in the standard is to fully write out the concept being ... there a reason for 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++ - Is it ok to compare floating points to 0.0 without epsilon?

I am aware, that to compare two floating point values one needs to use some epsilon precision, as they are not ... one should not rely on that. See Question&Answers more detail:os...

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

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