Questions tagged [c++]
C++ is a general-purpose programming language. Use this tag for questions about/utilizing C++. Do not also tag questions with [c] unless you have a good reason. C and C++ are different languages. Use a versioned tag such as [c++11], [c++20] etc. for questions specific to a standard revision.
809,940
questions
1
vote
1
answer
32
views
explicit deleted constructors - does this matter?
When marking a constructor as deleted, i.e.
class MyClass {
// ...
MyClass(int x) = delete;
// ...
};
is there any effect to marking the deleted constructor as explicit? i.e.
...
- 66.4k
2
votes
1
answer
1k
views
Can't find c++ header files and MacOSX12.1.SDK through CMake in Clion macOS. But Xcode is working
I'm in macOS Monterey 12.3.
When I try to load my CMAKE file on CLion. I got this error, it says that it can not find the MacOSX12.1.SDK. But my current version is in 12.3. I'm not sure why it goes to ...
- 35.4k
0
votes
1
answer
51
views
ambiguous partial specializations
I have a big 3rd party library that I am trying to compile with latest clang (version 19) and I keep running into ambiguous partial specializations error. A minimal sample to reproduce the issue looks ...
- 1,270
-1
votes
0
answers
21
views
What does "+ +" (with space between + operators) do in C++? [duplicate]
The following code:
float a = 1.5;
float b = a + + 1.2;
compiles and actually returns 2.7 for b. Why does it compile, shouldn't the extraneous + be flagged as a syntax error?
It compiles on several ...
- 17
40
votes
5
answers
25k
views
C++ equivalent of Rust's Result<T, E> type?
I like using std::experimental::optional in my C++ code, but the problem is value_or requires the default value to be of the same type as the optional's value.
This doesn't work very well when I want ...
0
votes
0
answers
12
views
How do I create CRUD in C++ and connect it to a database. A sample code or link to specific Youtube tutorial will be helpful. Thank you [closed]
I do not how to Create, Read, Update, and Delete database in C++
I tried to install mysql on my computer and I cannot connect it.
My laptop's operating system is windows. I am finding it difficult to ...
-1
votes
1
answer
26
views
getting "expression list treated as compound expression in functional cast" CE, but everything looks just fine
I tried building this:
whole code (unordered_map.h): https://pastebin.com/u9aMaqRp
test: https://pastebin.com/KqrKwNt0
and got a CE out of nowhere...?
getting a strange compilation error while ...
0
votes
1
answer
61
views
How to build recursion to calculate intermediate points if the distribution law is known
Interstage temperatures
There is a problem: calculate interstage temperatures of the thermoelectric module. Each interstage temperature could be defined by neighboring temperatures as Ti=pow(Ti+1 * ...
- 1
39
votes
7
answers
80k
views
How to use SDL2 and SDL_image with cmake
I'm looking for the simplest way to compile a c++ program using SDL2 and SDL_image with cmake.
Here is my best attempt, after hours of searching:
CMakeLists.txt
project(shooter-cmake2)
...
- 1
57
votes
20
answers
118k
views
VS Code will not build c++ program with multiple .cpp source files
I'm trying to build a simple program that has multiple .cpp files. I'm using VS Code on Ubuntu 17.10 and using the GCC Compiler.
Here's an example of what I've got (all the files are in the same ...
- 21.1k
6
votes
4
answers
5k
views
Which is more efficient for sines and cosines? Sin and Cos or Sin and Sqrt?
Unfortunately, the standard C++ library doesn't have a single call for sincos, which gives a place for this question.
First question:
If I want to calculate a sin and a cos, is it cheaper to ...
- 1,757
-11
votes
0
answers
51
views
EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ff8ed191184, pid=51412, tid=0x0000000000009a34 [closed]
I am writing protection for the maincraft cheat in the form of a native and when I added lazy importer I started having such errors
# A fatal error has been detected by the Java Runtime Environment:
#
...
- 29.4k
0
votes
0
answers
10
views
Using GDALWarp to combine and crop HGT files
I'm trying to take a bounding box, and crop only that section from whatever source amount of HGT files are needed. I see it should be possible from this. Using GDALWarp with the following results in ...
- 34.8k
0
votes
0
answers
68
views
How to determine the actual (not theoretical) maximal size of vector in C++ [duplicate]
Is there a way to determine the actual maximal vector size possible at run time (in C++), other than trying vec.resize(size) for different sizes by trail and error? (vec.max_size() provides only the ...
- 301
0
votes
2
answers
72
views
Templated constructor of abstract class without parameter type deduction in C++
I want my abstract base class to have a templated constructor, but can't get it to work without an extra parameter to deduct the type from.
I want to do something like this:
class Base {
public:
...
- 44.9k