non-type Questions
4
Solved
If we have a template function which takes a non-type parameter of type int or short the compiler complains about the ambiguity of the following call:
// Definition
template <int I> void foo...
4
Solved
According to the reference, the name of a non-type template parameter is optional, even when assigning a default value (see (1) and (2)). Therefore these template structs are valid:
template <i...
Oro asked 20/1, 2020 at 14:1
2
Consider the following structure: S is a class template with a variadic pack of template type parameters ...Ts. The class contains a nested class template N, which has a single template template pa...
Dalhousie asked 26/11, 2020 at 3:12
2
Solved
Consider this code:
using func = int (*)(int, int);
template<func F>
void do_something(int first, int second) {}
int something(int first, int second) { return 42; }
void f()
{
constexpr a...
Petition asked 30/11, 2020 at 16:54
1
Solved
Consider the following class S containing a function pointer, and a constexpr object s of that class initialized with a lambda:
struct S
{
void (*f) ();
};
constexpr S s { []{} };
Now if I wr...
Hagio asked 3/11, 2020 at 2:24
1
Solved
I am reading again "C++ Primer, 5th edition". In chapter 16 about templates, there is an example of "template Non-type parameters":
template<unsigned N, unsigned M>
int co...
0
For the following code:
template<class... Parameter> struct Outer
{
template<Parameter... Value> struct Inner
{
static bool Member;
};
};
template<class... Parameter>
templat...
Kilkenny asked 31/8, 2020 at 14:25
3
Solved
Is the following code legal?
template <auto Lambda>
struct A {};
int main () {
auto lmb = [](int i){return i*i;};
A<lmb> a;
return 0;
}
I noticed that g++ compiles it fine,...
1
Solved
I am unsure whether this is a compiler bug, or whether I have done something that goes against the standard to cause undefined behaviour. Here is my code:
#include <iostream>
template<aut...
Depersonalize asked 4/7, 2019 at 11:5
3
Solved
I'm a bit confused about partial template specialization... I have some code that depends on an arithmetic data type T, and on a small integer DIM. I want to be able to specify different class meth...
Crayton asked 19/12, 2017 at 2:28
2
Solved
I am trying to achieve the following:
template<template<typename> bool Function_, typename ... Types_>
constexpr auto find(Tuple<Types_ ... >) noexcept
{
// ...
}
where a pos...
Scuttle asked 12/7, 2017 at 4:9
3
Solved
Let's say I have two structs, Foo and Bar:
template<int...>
struct Foo{};
template<unsigned long...>
struct Bar{};
I want to create a type trait (call it match_class) that returns t...
Winshell asked 30/5, 2017 at 13:21
2
Solved
The following snippet compiles with no error with Clang 4.0 but GCC 7.0 produces errors (note the use of -std=c++1z flag).
using FuncT = int (*)(double);
template <FuncT FUNC>
int temp_foo...
1
Solved
Consider an example:
#include <type_traits>
template <class T, T>
struct has_duplicates_info { };
template <class T, T...>
struct has_duplicates;
template <class T, T First...
1
Solved
I have read many questions and answers, but this question caught my eye the most; it and its answers are helpful but I still feel that I do not fully understand the uses and the theories behi...
2
Solved
I have the following non-type template:
template<size_t MAX_SIZE>
struct Path{
struct Point{
float x;
float y;
}
};
Point segment[MAX_SIZE];
};
If I now declare two different Paths, ...
Pteridophyte asked 6/4, 2016 at 14:38
5
Section 4.3 of C++ Templates
states 'Not being able to use
floating-point literals (and simple
constant floating-point expressions)
as template arguments has historical
reasons.'
Similarly...
2
Solved
Why is it that the template argument of a non-type reference cannot be another reference (g++ 4.8.1):
template <int& N> void test() { }
int x = 5;
int& p = x;
int main(){
test<...
3
Solved
In the C++ template terminology we have non-type template parameters, type template parameters, and template template parameters (and then the same list with arguments).
Why is it called non-type?...
4
Solved
Maybe I'm tired, but I'm stuck with this simple partial specialization, which doesn't work because non-type template argument specializes a template parameter with dependent type 'T':
template <...
Belindabelisarius asked 18/3, 2014 at 17:13
3
Solved
First of all, I'm sorry for the vague title of this question. I wasn't sure how to summarize it.
The thing I want to achieve is the following, I want to be able to pass template non-type paramete...
Plano asked 10/1, 2014 at 16:24
1
Solved
C++ allows non-type template parameters to be of pointer, including function pointer, type. I recently asked a question about what this is useful for, and this is a follow up to one of the answers....
Changchangaris asked 19/7, 2013 at 0:41
1
The following program compiles without errors or warning with gcc 4.8.1,
-Wall -std=c++11:
template<unsigned N>
struct A{};
int main(){
A<1-2> a;
(void)a;
return 0;
}
clang 3.3 w...
Tormentor asked 9/7, 2013 at 22:8
5
Solved
C++ allows non-type template parameters to be of integral or enumeration type (with integral including boolean and character), as well as pointers and references to arbitrary types.
I have seen in...
1
Solved
I'm having difficulty defining and specializing a member function update() of an inner class Outer<T1>::Inner that is templated on a non-type (enum) argument.
#include <cstdlib>
templ...
Jaynejaynell asked 8/2, 2013 at 16:9
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