Recent questions tagged c++

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c++ - OneOfAType container -- storing one each of a given type in a container -- am I off base here?

I've got an interesting problem that's cropped up in a sort of pass based compiler of mine. Each pass ... this clearer/easier to understand? 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 the console in a GUI app in windows, only if its run from a console

My application is a GUI app that has helpful (though optional) information through the terminal (via cout). In ... is run from a console? 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 a object or struct as threadprivate in OpenMP?

I don't know how to make a struct or object as threadprivate, what I'm doing generates a error: struct point2d{ ... ",&myPoint); myfunc(); } } 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++ - Caffe layer creation failure

I'm trying to load in TEST phase a network configuration which has a memory data layer first and then a ... could I solve it? 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++ - change variable name with a loop

Is there a way without using arrays to write the following with a loop: cout<<"This variable c1 ="c1 cout<<"This variable ... .) { c7 +=x[i]; } 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++ - Structured bindings width

Is it possible to determine how many variable names should I to specify in square brackets using structured ... possible with coming Concepts? 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++ - Check if parameter pack contains a type

I was wondering if C++0x provides any built-in capabilities to check if a parameter pack of a variadic template contains a ... )? 1 : 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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c++ - How can the allowed range of an integer be restricted with compile time errors?

I would like to create a type that is an integer value, but with a restricted range. Attempting to create an ... names). Is this 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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c++ - How to detect that a given PE file (exe or dll) is 64 bit or 32 bit

I need to detect whether a given .dll or .exe file is 32 bit or 64 bit At the moment I have only ... notice or some special system 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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c++ - gcc 4.7 on linux pthreads - nontrivial thread_local workaround using __thread (no boost)

In C++11 you can have a non-trivial object with thread_local storage: class X { ... } void f() { thread_local ... two methods is, if any. ? 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++ - Floating point mismatch between compilers (Visual Studio 2010 and GCC)

I'm trying to solve a cross-platform issue that's cropping up and I'm not sure quite how to go ... all floating point operations 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++ - Unicode/special characters in variable names in clang not allowed?

This question has unicode text that may not display correctly in all browsers. clang now (>3.3) supports unicode characters in ... ?, ????????. 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++ - c++11 get type of first (second, etc...) argument, similar to result_of

Let's suppose I have a template function which takes an argument, which is a function (it can be a std::function, ... the right way to do it.) 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 aligned memory with new?

I currently allocate my memory for arrays using the MS specific mm_malloc. I align the memory, as I'm doing some ... Linux)? Thanks for any help See Question&Answers more detail:os...

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

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440 views

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c++ - How to deal with Eclipse CDT+Cygwin?

Recently I installed Eclipse Indigo Service Release 2(for JAVA EE) and installed CDT 8 online.Then I installed ... file scanner info profile. 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 a boost graph in graphviz with one of the properties displayed?

I see examples of this when using property maps, but not when using structs to handle the vertices and edges (I think ... . How can I do 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++ - Rasterizing a 2D polygon

I need to create a binary bitmap from a closed 2D polygon represented as a list of points. Could you please point ... so it can be useful too. See Question&Answers more detail:os...

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

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449 views

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c++ - How to load JPG/PNG Textures in an SDL/OpenGL App under OSX

i am writing an SDL / OpenGL application that runs under OSX. I have to use existing code which uses the DevIL ... is entirely written in C++. 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++ - Simulating a BlueScreen

I am trying to make a program that records a whole bunch of things periodically. The specific reason is that if it ... using is CC++. 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++ - Switch statement variadic template expansion

Let me please consider the following synthetic example: inline int fun2(int x) { return x; } inline int ... gcc always generates function call. 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++ - Deallocating objects stored in a vector?

I have a class that creates a vector of objects. In the deconstructor for this class I'm trying to deallocate the ... to what I'm doing wrong? 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++ - Create a 2D array with variable sized dimensions

I want to be able to create a 2d array the size of the width and height I read from a file, but I get ... 0] array = new int[width][height] See Question&Answers more detail:os...

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

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672 views

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c++ - Encode/Decode std::string to UTF-16

I have to handle a file format (both read from and write to it) in which strings are encoded in UTF-16 (2 bytes ... Mac) and cannot use C++11. See Question&Answers more detail:os...

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

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186 views

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c++ - Is comparing to zero faster than comparing to any other number?

Is if(!test) faster than if(test==-1) I can produce assembly but there is too much assembly produced and I ... short cut. thanks for any help. 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++ - Do I have to return a reference to the object when overloading a pre-increment operator?

Can I use: MyClass& MyClass::operator++ () { a++; // private var of MyClass return (*this); } Or it can be: ... ), and the same use of 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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627 views

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c++ - template pass by value or const reference or...?

I can write a templated function this way template<class T> void f(T x) { } or this way template<class T> ... a rule of thumb for this? 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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250 views

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c++ - How can I get gcc to add a prefix to all symbol names

I know that in the past there was an option -fprefix-function-name that would add a prefix to all generated ... any other way to do 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++ - Are `x = &v` and `*x = v` equivalent?

int * x; int v = 7; Given this code, what is the difference between 1. x = &v , and 2. *x ... the only significant difference between the two? See Question&Answers more detail:os...

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

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