Recent questions tagged C++

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c++ - Initializing a vector of vectors having a fixed size with boost assign

Having a vector of vector with a fixed size, vector<vector<int> > v(10); I would like to initialize it so ... how to do that. Thanks in advance 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++ - Difference between size_t and std::size_t

What are the differences between size_t and std::size_t in terms of where they are declared, when they ... any other differentiating features? 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 generate and run native code dynamically?

I'd like to write a very small proof-of-concept JIT compiler for a toy language processor I've written ( ... little idea where to start looking. 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++ - Linear index upper triangular matrix

If I have the upper triangular portion of a matrix, offset above the diagonal, stored as a linear array, how can the (i,j ... =5) = (1, 3) [etc] 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++ - Do .bss section zero initialized variables occupy space in elf file?

If I understand correctly, the .bss section in ELF files is used to allocate space for zero-initialized variables. ... am I seeing wrong here? 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++ - Multiple instances of singleton across shared libraries on Linux

My question, as the title mentioned, is obvious, and I describe the scenario in details. There is a class named ... of the singleton class. 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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c++ - Difference between CMake and NDK-build in android studio project

What is the actual difference between CMake and NDK build in android studio project. I already went through google ... we need to use what? 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++ - Correct usage of rvalue references as parameters

Let's take the following method as an example: void Asset::Load( const std::string& path ) { // ... to writing rvalue versions of methods? 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 would one call std::forward on all arguments in a variadic function?

I was just writing a generic object factory and using the boost preprocessor meta-library to make a variadic ... syntax that would work? 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 performance penalty of C++11 thread_local variables in GCC 4.8?

From the GCC 4.8 draft changelog: G++ now implements the C++11 thread_local keyword; this differs from ... s new implementation of thread_local? 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++ - Easy check for unresolved symbols in shared libraries?

I am writing a fairly large C++ shared-object library, and have run into a small issue that makes debugging a ... a better way of solving 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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c++ - Why is 'pure polymorphism' preferable over using RTTI?

Almost every C++ resource I've seen that discusses this kind of thing tells me that I should prefer ... ' preferable over using RTTI? 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 check if std::map contains a key without doing insert?

The only way I have found to check for duplicates is by inserting and checking the std::pair.second for false, ... map.contains(key); 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++ - When to use template vs inheritance

I've been looking around for this one, and the common response to this seems to be along the lines of "they ... of inheritance and vice versa?" 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 use an initialization method instead of a constructor?

I just got into a new company and much of the code base uses initialization methods instead of constructors. ... instead of a constructor? 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++ - Python: SWIG vs ctypes

In python, under what circumstances is SWIG a better choice than ctypes for calling entry points in shared libraries? ... metrics of the two? 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++ - Does std::vector.clear() do delete (free memory) on each element?

Consider this code: #include <vector> void Example() { std::vector<TCHAR*> list; TCHAR* pLine = new TCHAR[20]; ... before / after list.clear()? 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++ - Default member values best practice

Is it good practice when writing C++11 code to set default values for class members in the header file of the ... Which one is better 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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c++ - Easiest way to flip a boolean value?

I just want to flip a boolean based on what it already is. If it's true - make it false. If it's false - ... = true; } break; default: break; } 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 throw std::exceptions with variable messages?

This is an example of what I often do when I want to add some information to an exception: std::stringstream errMsg; ... a nicer way to do 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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c++ - Overriding return type in function template specialization

I would like to specialize a function template such that the return type changes depending on the type of the template ... can't use C++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 to get duration, as int milli's and float seconds from <chrono>?

I'm trying to use chrono library for timers and durations. I want to be able to have a Duration frameStart; ... to use this library correctly. 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 rand()%6 biased?

When reading how to use std::rand, I found this code on cppreference.com int x = 7; while(x > 6) x = ... right? Tried it and it works perfectly. 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 determine the Boost version on a system?

Is there a quick way to determine the version of the Boost C++ libraries on a system? 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++ - When to use const char * and when to use const char []

I know they are different, I know how they are different and I read all questions I could find regarding ... know about char pointer/array) 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++ - Generate a plane with triangle strips

What would be the best algorithm to generate a list of vertices to draw a plane using triangle ... glDisableClientState(GL_VERTEX_ARRAY); } 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++ - Should every class have a virtual destructor?

Java and C# support the notion of classes that can't be used as base classes with the final and sealed keywords. ... from, what do you think? 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++ - Will my iPhone app take a performance hit if I use Objective-C for low level code?

When programming a CPU intensive or GPU intensive application on the iPhone or other portable hardware, you have ... in real-world scenarios. See Question&Answers more detail:os...

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

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