All Questions
Tagged with value-type c++
24
questions
-1
votes
3
answers
91
views
C++ function as a parameter where its parameter can be passed by value or by reference
I have the following functions where processArray is a generic function that is used to process an array. A function is passed to it as a parameter so that each element can also be processed.
template&...
- 1,340
1
vote
2
answers
64
views
c++ template template syntax: simplicity vs useability why not 'auto'
first code below compiled fine after sweating with the word 'class' five times
in one line, and definition in "main" of shelf<std::vector, int> top_shelf;
looks too fragmented to me, ...
- 25
1
vote
2
answers
162
views
C++ : rebind variable of generic type
Re-use heap memory for generic types by rebinding variables.
What I want to do:
template <typename T> //unconstrained type
//...
{
//in some complex procedural logic
T rebindable = .../*r-...
user13507303
4
votes
2
answers
1k
views
Access only one element of a pair in an unordered_map in c++
I'm trying to get the same behavior as a rust tuple destructuring in C++.
For example: I have an unordered_map I want to iterate over. However, The only data that I care about are the values, and not ...
- 113
1
vote
2
answers
691
views
How can I create a value_type type trait?
I am writing a program that will deal heavily with strings of varying types (i.e. std::string, std::string_view, const char*, char[], and friends with varying CharT). So, I am interesting in writing a ...
- 115
0
votes
3
answers
50
views
I have template function. by using function std::for_each replace every positive number by biggest number from this container
template function gets 2 iterators, begin and end iterators.
template data type iterType is iterator type. I have error when trying to equate current iterator value to maximal value in lambda function ...
2
votes
3
answers
129
views
Can you use a member of deleter to keep alive a shared_ptr?
Given the following types
// interface and implementation used in one part of the codebase
struct Image
{
virtual std::vector<uint8_t>& GetData () = 0;
};
struct VecImage : public ...
- 1,326
0
votes
1
answer
703
views
STL Iterator Inheritance : 'value_type' does not name a type
I am stuck trying to understand where this error comes from:
error: ‘value_type’ in ‘struct std::iterator_traits<sha::Vector<int>::h_iterator>’ does not name a type
I am trying to ...
- 127
8
votes
3
answers
3k
views
Polymorphism (inheritance) and value types
I have a bunch of types, PixelMeasure, PointMeasure, CentimeterMeasure and so on, that represent a value with a unit. I would like them to have
value semantics: e.g. effectively immutable, don't have ...
- 9,890
-2
votes
1
answer
1k
views
c++ template argument deduction/substitution failed, in void parameter function [closed]
I try to implement simple get() function in linked list, which can store various types of data
(One list can store char, string, int, float, ... in each node)
class List{
//...
template<...
- 143
-1
votes
2
answers
200
views
Why Can't I Get the bool Value from a value_type Returned by decltype?
This appears to be a visual-studio problem. This code runs fine in gcc but fails to compile in Visual Studio:
#include <iostream>
#include <type_traits>
#include <typeinfo>
using ...
- 38.6k
6
votes
2
answers
1k
views
Traits class to extract container's value_type from a back_insert_iterator
The std::back_insert_iterator has value_type equal to void, but it also has a protected member container that holds a pointer to the underlying Container. I am trying to write a traits class to ...
- 70.1k
1
vote
2
answers
2k
views
C++ Array or Vector of template classes with different value-type template parameters
One application needs to handle a set of datasets on which some operations can be performed. Each data set contains an array of points of a specific data type (int32, int16, float, complex) and the ...
- 11
1
vote
1
answer
2k
views
Why "const" is ignored in "const typename iterator_traits<RandomIterator>::reference"?
I have the following function and vector:
template <class RandomIterator> RandomIterator upperBound(RandomIterator start, RandomIterator end, const typename iterator_traits<RandomIterator&...
- 55
32
votes
4
answers
21k
views
How can I get sizeof a vector::value_type?
I want to get sizeof of the type that is contained in a vector. Here is what I tried:
#include <iostream>
#include <vector>
int main()
{
std::vector<uint> vecs;
std::cout &...
- 7,074