Recent questions tagged C++

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c++ - A reference can not be NULL or it can be NULL?

I have read from the Wikipedia that: References cannot be null, whereas pointers can; every reference refers ... Please elaborate this point. 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 cin and cin.get() for char array

I have these 2 codes: char a[256]; cin>>a; cout<<a; and char a[256]; cin.get(a,256);cin.get() ... someone explain for every case ! 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++ - How to Create a android native service and use binder to communicate with it?

My basic task is to create a native service in android and then write a simple native program to test it. lets ... and if needed in Java also. 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++ - Deletion of pointer to incomplete type and smart pointers

When trying to use an auto_ptr with a type that was declared with forward-declaration, like this: class A; ... ... . How can that be explained? 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++ - Exception vs. error-code vs. assert

I'm working on a library that generates reports of devices. The generate_report (const std::string& no) member ... unexpected. Any advice? :) 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++ - Variadic templates

C++0x will allow template to take an arbitrary number of arguments. What is the best use of this feature other than implementing tuples ? 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++ - Implementing Move Constructor by Calling Move Assignment Operator

The MSDN article, How to: Write a Move Constuctor, has the following recommendation. If you provide both a ... the move assignment operator? 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 check if two types are same at compiletime(bonus points if it works with Boost strong typedef)

I was wondering if it is possible to check if 2 types are same at compile time. What I came up with is(idk if ... standard(I would bet not :))? 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 different optimization levels lead to functionally different code?

I am curious about the liberties that a compiler has when optimizing. Let's limit this question to GCC and C/ ... send bounty to someone else.) 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 memset initializes an array of integers by -1?

The manpage says about memset: #include <string.h> void *memset(void *s, int c, size_t n) The memset() function fills ... -1 (a 4 bytes value)? 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++ - fatal error LNK1104: cannot open file 'libboost_system-vc90-mt-gd-1_43.lib'

Made a new project, added main.cpp and wrote the code at this URL: http://www.boost.org/doc/libs/1_43_0/ ... from the code under windows, VC9? 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++ - Catch lib (unit testing) and CTest (CMake) integration

I'm looking for successful example of Catch CatchLib integration with CMake test (Ctest) . as I understand this ... Fraser99's cmake script 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++ - What to put in precompiled header? (MSVC)

What are the best candidates for a precompiled header file? Can I put STL and Boost headers there, even ... settings to reduce compile times? 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 separate CUDA code into multiple files

I am trying separate a CUDA program into two separate .cu files in effort to edge closer to writing a real ... kernel functions and what not. See Question&Answers more detail:os...

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

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357 views

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c++ - GCC memory leak detection equivalent to Microsoft crtdbg.h?

After many years of working on a general-purpose C++ library using the Microsoft MSVC compiler in Visual Studio, ... new way of doing things? See Question&Answers more detail:os...

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

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267 views

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c++ - Why is inlining considered faster than a function call?

Now, I know it's because there's not the overhead of calling a function, but is the overhead of calling a ... I'm forgetting something, 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++ - Overload bracket operators [] to get and set

I have the following class: class risc { // singleton protected: static unsigned long registers[8]; public: unsigned ... How can it 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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555 views

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c++ - How can I include <bits/stdc++> in Xcode

I have tried to include the header file bits/stdc++ in my C++ code, but it seems the compiler doesn't support it. ... 10.10.2 and Xcode 6.1.1. 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 a POD in a struct zero-initialized by an implicit constructor when creating an object in the heap or a temporary object in the stack?

The standard and the C++ book say that the default constructor for class type members is called by the ... specially for the third case. See Question&Answers more detail:os...

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

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461 views

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c++ - What is the optimal size of a UDP packet for maximum throughput?

I need to send packets from one host to another over a potentially lossy network. In order to minimize packet ... just focusing on MTU alone. See Question&Answers more detail:os...

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

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219 views

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c++ - How to correctly use std::reference_wrappers

I am trying to understand std::reference_wrapper. The following code shows that the reference wrapper does not ... the std::reference_wrapper? See Question&Answers more detail:os...

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

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325 views

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c++ - Should I return an rvalue reference parameter by rvalue reference?

I have a function which modifies std::string& lvalue references in-place, returning a reference to the input ... transform(...) version? See Question&Answers more detail:os...

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

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321 views

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c++ - Linker error LNK1104 with 'libboost_filesystem-vc100-mt-s-1_49.lib'

During the process of linking my program to the boost::filesystem module in release mode I get the next error: ... and not the expected .exe. 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 don't I need to check if references are invalid/null?

Reading http://www.cprogramming.com/tutorial/references.html, it says: In general, references should always be ... anyone shed some light? See Question&Answers more detail:os...

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

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519 views

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c++ - pimpl idiom vs. bridge design pattern

I just noticed a new term pimpl idiom, what's the difference between this idiom with Bridge design pattern? I ... anybody give me an example? See Question&Answers more detail:os...

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

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297 views

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c++ - Fastest method for screen capturing on Linux

This question is similar to this one Fastest method of screen capturing but for linux/X11. To be more ... suggestions and ideas are welcome See Question&Answers more detail:os...

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

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264 views

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c++ - Vim [compile and] run shortcut

Basically what I want is a keyboard shortcut in vim that lets me [compile and] run the currently being edited C ... it if this was possible! See Question&Answers more detail:os...

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

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570 views

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c++ - How to create a variadic generic lambda?

Since C++14 we can use generic lambdas: auto generic_lambda = [] (auto param) {}; This basically means that ... possible in a std::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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