Recent questions tagged C++

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c++ - Overriding a default option(...) value in CMake from a parent CMakeLists.txt

I am trying to include several third-party libraries in my source tree with minimal changes to their build system ... .txt for these projects? 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 adding inline assembly comments cause such radical change in GCC's generated code?

So, I had this code: constexpr unsigned N = 1000; void f1(char* sum, char* a, char* b) { for(int ... GCC's optimizer hindered by asm comments? 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 use enum class as unordered_map key

I have a class containing an enum class. class Shader { public: enum class Type { Vertex = GL_VERTEX_SHADER, ... is causing the error 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++ - Why do I need std::get_temporary_buffer?

For what purpose I should use std::get_temporary_buffer? Standard says the following: Obtains a pointer to storage ... It merely slows down. 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 does && mean in void *p = &&abc;

I came across a piece of code void *p = &&abc;. What is the significance of && here? I know about rvalue references ... in void *p = &&abc; ? 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 a sample code that will crash and produce dump file?

I started learned windbg and I found this good post How to use WinDbg to analyze the crash dump for VC++ ... find the dump file? Thank you 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 happens in assembly language when you call a method/function?

If I have a program in C++/C that (language doesn't matter much, just needed to illustrate a concept): ... but what's the basic principle? 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 build in release mode with optimizations in GCC?

What are the specific options I would need to build in "release mode" with full optimizations in GCC? If there ... please list them all. 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++ - Difference between Singleton implemention using pointer and using static object

EDIT: Sorry my question was not clear, why do books/articles prefer implementation#1 over implementation#2? What ... unwanted destruction }; 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++ - Passing a parameter to a comparison function?

When using the STL sort algorithm on a vector, I want to pass in my own comparison function which also ... comparison function..? 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++ - mysql.h file can't be found

i'm trying to install connection between c++ and mysql in ubuntu 12.04. i've installed mysql-client, mysql ... : ld returned 1 exit status 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 non-static data members be constexpr?

This is valid code: struct S { constexpr S(int x, int y): xVal(x), yVal(y) {} constexpr S(int x ... members may be declared constexpr. But why? 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++ - Error: macro names must be identifiers using #ifdef 0

I have the source code of an application written in C++ and I just want to comment something using: ... identifiers Why is this happening? 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 std::pair?

What is std::pair for, why would I use it, and what benefits does boost::compressed_pair bring? 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++ - Optimize in CMake by default

I have a C++ project which uses CMake as its build system. I'd like the following behavior: If cmake is ... do to get the desired 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++ - Syntax error with std::numeric_limits::max

I have class struct definition as follows: #include <limits> struct heapStatsFilters { heapStatsFilters(size_t minValue_ = 0, ... C++ 11 (2012) 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++ - Adding message to assert

Hallo! I'm looking for a way to add custom messages to assert statements. I found this questions Add custom messages ... example "x was 100". 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 organize members in a struct to waste the least space on alignment?

[Not a duplicate of Structure padding and packing. That question is about how and when padding occurs. This one ... upcoming C++20 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++ - What does `std::kill_dependency` do, and why would I want to use it?

I've been reading about the new C++11 memory model and I've come upon the std::kill_dependency function ( ... to choose to kill a dependency? 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 C++11 features does Visual Studio 2010 support?

There is a list for GCC; is there a similar list for Visual Studio 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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342 views

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c++ - Iterator to last element in std::list

#include <list> using std::list; int main() { list <int> n; n.push_back(1); n.push_back(2); n.push_back( ... iter to the last element in 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++ - What are ALL_BUILD and ZERO_CHECK and do I need them?

I've created a simple CMakeLists.txt: cmake_minimum_required(VERSION 2.8) project (HelloWorld) add_executable (HelloWorld ... do I need them? 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++ - Shared libraries and .h files

I have some doubt about how do programs use shared library. When I build a shared library ( with -shared - ... ie just including stdlib.h etc. 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++ - Should I define static inline methods in header file?

I've read about how it is usually best not to define anything in header files because redundant copies are ... to directly address this issue. 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++ - Fast string splitting with multiple delimiters

I investigated some time here on StackOverflow to find good algorithms to split strings with multiple delimiters into a ... to do it faster? See Question&Answers more detail:os...

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

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255 views

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c++ - Reading a file located in memory with libavformat

I'm currently trying to read small video files sent from a server In order to read a file using ... or an alternative to av_open_input_file? See Question&Answers more detail:os...

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

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330 views

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c++ - Difference between std::remove and erase for vector?

I have a doubt that I would like to clarify in my head. I am aware of the different behavior for std: ... , that difference might matter, right? See Question&Answers more detail:os...

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

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227 views

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c++ - How to import python module from .so file?

[me@hostname python]$ cat hello_world.cc #include <string> #include <Python.h> #include <boost/python.hpp> namespace { ... . what am I missing? See Question&Answers more detail:os...

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

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