Recent questions tagged C++

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c++ - Why is a = i + i++ undefined and not unspecified behaviour

I read through several very good answers about undefined behaviour and sequence points (e.g. Undefined behavior ... and others are undefined. 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++ - Constructing a vector<int> with 2 string literals

For the following program: #include <vector> #include <iostream> int main() { std::vector<int> v = {"a", ... correct behavior? Here's the code. 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++ - Namespace using declaration (bug in GCC/VS2010)?

namespace A{ int i; } int main(){ using A::i; using A::i; } VS2010 - compiles fine gcc (ideone) - ... it was unrelated to the query on hand. 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++ - OpenGL GLFW: undefined reference to 'glfwInit'

I realize that this question has been asked many times on StackOverflow and on other sites; after reviewing ... information would be helpful. 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 portable is casting -1 to an unsigned type?

The other day, I came across this construct: static_cast<size_type>(-1) in some example C++ code, which is ... + (many surprising things 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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c++ - Expecting googlemock calls from another thread

What will be the best way to write (google) test cases using a google mock object and expect the EXPECT_CALL() ... change the Bar class 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 could std::experimental::source_location be implemented?

C++ Extensions for Library Fundamentals, Version 2 (N4564) introduces the type std::experimental::source_location. § ... 't find anything yet. 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++ - packing algorithm in rtree in boost

Hi all I understand that if rtree is created with range values in boost it would use packing algorithm. I ... with packing algorithm in 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++ - Visual Studio Code c++11 extension warning

I am in the process of learning c++ and I'm using visual studio code for Mac. I use Code Runner to run my program. ... -x64" } ], "version": 4 } 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 any way to define a constant value to Java at compile time

When I used to write libraries in C/C++ I got into the habit of having a method to return the compile date ... JAR file as suggested by serg10. 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++ - pass function by value (?) instead of function pointer?

Sorry if this has been asked before, but I was unable to find it. So im trying to educate myself about ... that even makes any sense)? 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 WIN32 defined, and how can I include this definition in my project?

I am including a third party header and source file into my project. At the top of the header there is ... defined in my current new project? 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 openCV's convertto function not work?

I have an image which has 4 channels and is in 4 * UINT8 format. I am trying to convert it to 3 channel ... of 4th (alpha) channel in OpenCV? 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++ - Best platform independent pi constant?

I know that you can use: #define _USE_MATH_DEFINES and then: M_PI to get the constant pi. However, if I ... there is a designated mechanism. 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++ - "as if" in language standards

What is the exact meaning of the phrase "as if" in the standard and how does it work when a user can ... both the plain and nothrow versions? 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't understand the declaration #3 in the Example of [basic.link]/6 C++14

[basic.link]/6 The name of a function declared in block scope and the name of a variable declared by a block ... . What am I missing here? 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++ - Returning *this in member functions

I recently used a library that allows the following type of syntax: MyClass myObject; myObject .setMember1("string ... doing it like 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++ - Using concurrently 2 versions of boost

I'm using RHEL 5.3, which is shipped with gcc 4.1.2 and boost 1.33. There're some features ... binary boost libraries from different releases? 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++ - CEdit control MFC, placing cursor to end of string after SetWindowText

I am using VC9, I've a CEdit control whose contents are reset to default test (say - "fill-in") at the ... string. How can this be done? 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++ - non-blocking std::getline, exit if no input

Currently I have a program that reads from the standard input, occasionally the program needs to just keep running if ... and tested on unix). 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++ - Friend lookup exception from template-id?

Consider the following clause in [namespace.memdef]/3: If the name in a friend declaration is neither qualified ... that this clause solves? 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 a temporary object with static storage duration

Inspired from this answer, from [expr.const] A constant expression is either a glvalue core constant expression ... Applies to variables 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++ - Concatenation of LPWSTR strings

In Visual C++, I have a LPWSTR mystring; which is already defined somewhere else in the code. I want to create a ... lot in advance, I'm lost! 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 do I need to #include <typeinfo> when using the typeid operator?

The typeid represents a C++ RTTI operator being also a C++ keyword. It returns a std::type_info object ... including the header <typeinfo>? 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 is_lock_free a member function?

What is the reason for why is_lock_free requires an instance (it's a member function)? Why not a metafunction of ... of why it is necessary. 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++ - ___sincos_stret undefined symbol when linking

Like previously referred here, ___sincos_stret can not be found when compiling a project that uses this symbol using the ... is the link step. See Question&Answers more detail:os...

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

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338 views

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c++ - Trying to use qsort with vector

I'm trying to learn c++ and was trying using sort and qsort. sort() works just fine but qsort doesn't, I ... ); showvec(numbers); return 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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377 views

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c++ - is it possible to place std::vector to shared memory?

i would to create std::vector in shared memory using CreateFileMapping() windows API function. I know how to ... of vectors to resize 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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