802 questions
1
vote
1
answer
130
views
Unexpected overload resolution on clang [duplicate]
(I was making an integer class to replace C's stuff, then this hit me. I wanted an overload for pointer arithmetic.)
MSVC and GCC pass without errors or warnings.
Compilation:
g++ -std=c++2c -fsyntax-...
- 365
15
votes
1
answer
698
views
How does overload resolution select from multiple prospective destructors?
After seeing this post: If a class has a destructor declared with a requires clause that evaluates to false, why is the class not trivially destructible? I have a separate question, and I haven't ...
- 609k
1
vote
1
answer
138
views
Partial ordering of overloaded function templates seems to fail, why?
Consider the following example:
#include <iostream>
#include <vector>
template<typename T>
void foo( T && )
{
std::cout << "Common foo!\n";
}
template&...
- 2,073
0
votes
0
answers
50
views
Pass a variadic templated function taking universal references as pointer to a utility
I have a problem with an attempt at factorizing two utility functions, each calling a given "hardcoded" function, into one utility with a functor call instead. Meaning I have a factoring ...
- 6,867
6
votes
3
answers
159
views
Is there a way to rank user-defined conversions between class templates mirror the ranking of conversions of their template arguments?
Consider the following code (live example):
#include <memory>
struct Base {};
struct Middle : public Base {};
struct Derived : public Middle {};
void foo(Base*);
void foo(Middle*);
void ...
- 2,668
6
votes
1
answer
151
views
function selection finding unexpected candidate when using namespaces
This is a follow-up of this question: `requires` expressions and function namespaces
Trying to design an answer I stumbled on this strange behavior:
#include <cstdio>
// dummy default ...
- 3,479
5
votes
1
answer
196
views
Construction from nested brace-enclosed initializer list
I have a working program that compiles successfully in Visual Studio. But trying to port it to GCC/Clang resulted in some compilation errors.
Maximally reduced example is as follows:
#include <...
- 24.1k
2
votes
1
answer
121
views
C++ Templated Overload Resolution Fails Where Standard Resolution Wouldn't
There appears to be a discrepancy in how templated function overloads are resolved and how non-templated function overloads are resolved, but there seem to be some cases where it should not make a ...
4
votes
2
answers
101
views
Why does class extending raw type result in overload ambiguity?
Why is method(new ExtendsRaw()) ambiguous in the code below?
public class Main {
private Main() {}
static class Generic<T> {}
@SuppressWarnings("rawtypes")
static ...
- 755
1
vote
0
answers
73
views
"Preloading" a partial set of args into a variadic function [duplicate]
Objective
I'm attempting to wrap a variadic function so I can provide an arbitrary set of arguments now and provide the rest later.
Ultimately, I want to be able to do something like this:
template<...
1
vote
1
answer
62
views
Unable to call desired overload of a generated PInvoke function
I'm am testing out the C#/Win32 project so I can call Win32 Setup API functions with automatically generated PInvoke wrappers. I am unable to make my code call the correct overload of one of the ...
- 7,166
3
votes
1
answer
156
views
C++ overloading resolution when passing initializer lists as arguments
can anyone explain why both cases print "plain int"?
#include <iostream>
void f(const int (&)[2])
{std::cout<<"int array"<<std::endl;}
void f(const int&...
- 31
4
votes
1
answer
74
views
Store value category of pointed-to object (for later deref)
Ok this might be a bit difficult to explain:
I want to call a function hello that has an overload for either an rvalue or an lvalue ref of type Json. This Json object is converted from a JsonKey using ...
- 5,344
2
votes
2
answers
134
views
Simple string.Split failing with StringSplitOptions.TrimEntries
This returns an array with only one element and thus throws an exception. But it works when I omit StringSplitOptions.TrimEntries.
using System;
public class Program
{
public ...
- 29.6k
6
votes
1
answer
103
views
Do template parameter packs affect overload resolution?
Look at this code (godbolt):
template <typename ...T>
void func(const char *it, T &&...t) {}
template <typename A, typename B>
void func(A &&a, B &&b) {}
int main(...
- 30.5k