Recent questions tagged C++

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c++ - What's the exact semantics of deleted member functions in C++11?

struct A { A(); A(const A&); A& operator =(const A&); A(A&&) = delete; A& operator =(A&&) = ... this behavior defined by the C++ standard? 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 C-string gives Warning: "Address of stack memory associated with local variable returned"

I am not a C programmer, so I am not that familiar with C-string but now I have to use a C library so ... imply? and will it cause any 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++ - How to initialize static members in the header

Given is a class with a static member. class BaseClass { public: static std::string bstring; }; String has ... to define it in the header? 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 does std::declval add a reference?

std::declval is a compile-time utility used to construct an expression for the purpose of determining its type. It is ... p = nullptr; // OK 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++ - Improving g++ output

g++ sometimes produces pretty convoluted outputs. Specially when dealing with templates. Is there any tool that makes g+ ... my way out of 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++ - How do I call a static method of another class

I have a class, lets say CAppPath which has a static method: public: static CString GetAppPath(); and in ... make the class itself static? 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 cout << actually work?

I was wondering how std::cout is able to use << as it does. My main puzzlement is with whether std::cout ... done. Does anyone here know? 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++ - Where is the 'this' pointer stored in computer memory?

Where exactly is the 'this' pointer stored in memory? Is it allocated on the stack, in the heap, or in the ... Where is this stored in memory? 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::thread - naming your thread

The new C++ has this std::thread type. Works like a charm. Now I would like to give each thread a name ... portable. Is it possible at all? 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 write an evaluator for a string like "(1+3 * ( 5 / 4)) and get a numeric result

this is a interview question i am confused about its solution, i am thinking that i need stacks to ... do the necessary arthimetic operation? 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 call a function from a shared library?

What is the easiest and safest way to call a function from a shared library / dll? I am mostly interested in ... way to load it at runtime. 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++ - Incompatible with parameter of type "LPCWSTR"

#include "stdafx.h" #include <windows.h> #include <stdio.h> #include <iostream> #include <dos.h> using ... parameter of type "LPCWSTR" 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++ - If void() does not return a value, why do we use it?

void f() means that f returns nothing. If void returns nothing, then why we use it? What is the main purpose of void? 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 a boost ssl iostream?

I'm adding HTTPS support to code that does input and output using boost tcp::iostream (acting as an HTTP ... ; handle_request(ssl_iostream); } } 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++ - Jump Table Switch Case question

I am trying to understand some things about jump tables and its relationship between a switch case statement. ... or hashtable. 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++ - C++11 move constructor

What would be the correct way to implement a move constructor considering the following class: class C { public: ... of a move constructor? 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 an installer with CMake + CPack + NSIS on Windows?

I'd like to create a cross-platform installer for a C++ based system I am building. I use ... SET(CPACK_NSIS_MODIFY_PATH ON) INCLUDE(CPack) 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 an expression using modulo to do backwards wrap-around ("reverse overflow")?

For any whole number input W restricted by the range R = [x,y], the "overflow," for lack of a ... operands for the modulo operator differently. 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 correctly organize output into columns?

The first thing that comes to my mind is to do a bunch of 's, but that would cause words to be misaligned ... a string and then go from there? 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 an inline function and static inline function

Can anybody tell me what the difference is between an inline function and static inline function? In which cases ... in that translation unit? 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++ - Direct formula for summing XOR

I have to XOR numbers from 1 to N, does there exist a direct formula for it ? For example if N = 6 then 1^2^ ... I need an O(1) formula (if any) 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++ - Which is the fastest STL container for find?

Alright as a preface I have a need to cache a relatively small subset of rarely modified data to avoid ... supported by VS2010 or Boost. 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++11 and the lack of polymorphic lambdas - why?

I've been reviewing the draft version of the C++11 standard. Specifically the section on lambdas, and I ... Can lambda functions be templated? 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 was the rationale for making `return 0` at the end of `main` optional?

Starting with the C99 standard, the compiler is required to generate the equivalent of a return 0 or return ... explain its use to others. 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++ - Compilation fails randomly: "cannot open program database"

During a long compilation with Visual Studio 2005 (version 8.0.50727.762), I sometimes get the ... makes nightly compilation impossible. 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++ - Correct way of initializing a struct in a class constructor

So I want to add a struct from a c header file as a class member to a c++ class. But I get a compiler error ... {1, 0, "someString", 0x4}; } 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++ - malloc & placement new vs. new

I've been looking into this for the past few days, and so far I haven't really found anything convincing ... malloc method can thusly be used. 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++ - Explicit copy constructor behavior and practical uses

A recent question got me wondering about explicit copy constructors. Here is a sample code that I tried compiling under ... he's right not to. See Question&Answers more detail:os...

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

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