Recent questions tagged C++

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c++ - Why unique-ptr doesn't check base class to virtual destructible?

Consider this example : #include <cstdio> #include <memory> struct base { base( int i ): i(i) { printf("base ... then = delete this ctor. }; 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 install Visual Studio Build Tools 2010 on Visual Studio 2015 Community?

I have a project created on Visual Studio 2010. When I try to run the project on Visual Studio 2015 Community ... way to make the project work? 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 are functions of an object stored in memory?

Suppose we have a class: class Foo { private: int a; public: void func() { a = 0; printf("In Func ... program counter when calling foo->func()? 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++ - Linking archives (.a) into shared object (.so)

I'm compiling some shared objects file into an archive.a: $ g++ -c -Iinclude/ -fPIC -O0 -o object1.o source1. ... : *** [libKeynect.so] Error 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++ - How to define typedef of function pointer which has template arguments

I would like to make typedef for function pointer which has stl container as argument and this container has unknown ... especially in c++ 03) 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 this vector iterator not incrementable?

I'm trying to delete the vector's content and I'm getting an error - vector iterator is not incrementable, ... .erase(deleteIterator); } 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++ - Is it possible to convert a boost::system::error_code to a std:error_code?

I want to replace external libraries (like boost) as much as possible with their equivalents in standard C++ ... solutions? Thanks in advance! 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++ - Risks of different GCC versions at link / run time?

I'm using Intel's C++ compiler, which on Linux relies on the GNU-supplied libc.so and libstdc++.so. Here's ... the system-wide GCC 4.4 package? 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 strategies have you used to improve build times on large projects?

I once worked on a C++ project that took about an hour and a half for a full rebuild. Small edit, ... with large project dependency issues best? 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 did C++11 introduce delegating constructors?

I cannot understand what the use is of delegating constructors. Simply, what cannot be achieve without having delegating ... point. Any idea? 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++ - Porting std::map to C?

I am porting some c++ code to c. What is a viable equivalent of std::map in c? I know there is no ... not get the purpose its a Texture Map. 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++ - template argument deduction with strongly-typed enumerations

If I have a normal (weak) enumeration, I can use its enumerated values as non-type template parameters, like so: enum ... <decltype(E), E>(T)); 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::getline() returns

I have a loop that reads each line in a file using getline(): istream is; string line; while (!getline(is, ... should I stick to the first form? 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++ - Use of enable_shared_from_this with multiple inheritance

BI am using enable_shared_from_this in my code, and I am not sure if its usage is correct. This is the code ... called through shared_ptr of D? 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 print out the memory contents of a variable in C?

Suppose I do a double d = 234.5; I want to see the memory contents of d [the whole 8 bytes] How do I do that? 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++ - Arrays passed by reference by default?

I'm reading a C++ book which says this: C++ passes arrays to functions by reference-the called functions can ... ? From this Prentice Hall book: 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++ - Rewind an ifstream object after hitting the end of file

Having a text file with a few characters (lets say 10), you can try to read 1000 characters from it. char *buf ... get to the end of the 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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c++ - NOT(~) vs NEGATION(!)

#include <iostream> using namespace std; int main(int argc, char *argv[]) { int i=-5; while(~(i)) { ... i' the above two loops get executed? 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 to losslessly convert to and from std::string and QByteArray

What is the correct way to convert losslessly between std::string and QByteArray... mostly for the purpose of ... this is actually correct. 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 the differences between Intel TBB and Microsoft PPL?

I'm planning to start "playing" with task-based parallelism for a cross-platform project. I wanted to use ... cross-platform "real" 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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249 views

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c++ - How can I prevent a variadic constructor from being preferred to the copy constructor?

I have a template 'Foo', which owns a T, and I'd like it to have a variadic constructor that ... this non-const argument copy 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++ - Using an enumeration as a template parameter

I would like to use a template class to provide some common functionality to some child classes that are very ... to a template 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++ - Where does a std::vector allocate its memory?

Consider the following code snippet: #include <vector> using namespace std; void sub(vector<int>& vec) { vec. ... that it will be deleted? 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 am I getting "non-aggregate cannot be initialized with initializer list"

std::map<std::string, int> m = { {"Marc G.", 123}, {"Zulija N.", 456}, {"John D.", 369} }; In ... ++0X Support" Do I need to set something 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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267 views

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c++ - How do I print bytes as hexadecimal?

I know in C# you can use String.Format method. But how do you do this in C++? Is there a function that allows me ... to Hex, how do I do that? See Question&Answers more detail:os...

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

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242 views

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c++ - Check if two vectors are equal

How can I check whether the first "n" elements of two vectors are equal or not? I tried the following: #include ... "failure" and not "success"? 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 a standard definition for __cplusplus in c++14?

I'm looking to setup some preprocessor stuff, and I'd like a more exact number for what __cplusplus in C+ ... one mandated by the 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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614 views

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c++ - Using an enum as an array index

I have this enum: enum ButtonState { BUTTON_NORMAL = 0, BUTTON_PRESSED = 1, BUTTON_CLICKED = 2 }; const u8 ... that way in all compilers? See Question&Answers more detail:os...

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

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