A Boost C++ library providing an implementation of tuple, a fixed-sized collection of elements, possibly of different types
Questions tagged [boost-tuples]
54 questions
3
votes
4 answers
Tuples of unknown size/parameter types
I need to create a map, from integers to sets of tuples, the tuples in a single set have the same size. The problem is that the size of a tuple and its parameter types can be determined at runtime, not compile time. I am imagining something…
myahya
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3
votes
1 answer
How to assign a boost::tuple to boost::shared_ptr
In my code I have something like this
shrd_ptr_obj st = boost::make_shared();
Myobj tp = boost::make_tuple(0,0,0,0,0 );
How do I make st point to tp ?
Rajeshwar
- 11,179
- 26
- 86
- 158
3
votes
2 answers
Issue with key of std::map
Consider the following code. A tuple consisting of integer and vector of integer is defined as the key of a map. However, I was surprised that the compiler does not throw any error when inserting or looking for a tuple consisting of integer and…
sam
- 55
- 4
2
votes
3 answers
Define tuple with variable size
I want to define a boost fusion::vector in my class with the size defined by a template parameter. ATM I'm doing this with a specialization of a helper class, but I think there should be a way to do this with boost mpl/fusion or something else in…
Smittii
- 187
- 1
- 10
2
votes
1 answer
Traversing a C++ tuple in an order defined at runtime
It's possible to iterate over a boost or std tuple, but can I iterate in an order determined at runtime, while still retaining type information?
Suppose my tuple was filled with objects of type Foo:
#include
using namespace std;
template…
user2023370
- 10,488
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2
votes
2 answers
How does std::thread store variadic arguments passed through its constructor?
Let's say I declare a thread with the following code:
#include
#include
void printStuff(const char* c, long x) {
std::cout << x << " bottles of " << c << " on the wall\n";
}
int main()
{
std::thread t(printStuff, "beer",…
TwistedBlizzard
- 931
- 2
- 9
2
votes
3 answers
Does `boost::make_tuple` make copies?
I have something like this in my code
val = boost::make_tuple(objA , objB);
My question is does boost::make_tuple make copies of objA and objB ?
Rajeshwar
- 11,179
- 26
- 86
- 158
2
votes
1 answer
Boost::tuple's equivalent to Python's itemgetter?
I have some code that looks like this:
typedef tuple DataPoint;
vector data;
vector third_column_only;
// Code to read in data goes here.
transform(data.begin(), data.end(), back_inserter(values), tuples::get<1,…
user161827
1
vote
1 answer
Using boost::mpl::vector to create variadic templates?
I'm stuck with C++03 for now, and I want to create a global function that accepts any number of type-safe arguments (up to a reasonable limit if necessary, like 9).
I have access to the full boost library in my code base, so I'm hoping…
void.pointer
- 24,859
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1
vote
1 answer
How does the boost tuple 'get' method work?
After delving into the source of the excellent boost tuple class (tuple_basic.hpp), I can see that a recursive templated algorithm is used in the 'get' method for accessing the tuple members.
What I'm struggling to understand is how a numeric…
Gearoid Murphy
- 11,834
- 17
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- 86
1
vote
1 answer
Reference to ‘tuple’ is ambiguous in SESHAT
I have tried to build SESHAT(Handwritten math expression parser). And I have got an error like this below:
In file included from rnnlib4seshat/DataSequence.hpp:26:0,
from symrec.h:30,
from production.h:28,
from…
Duy Huynh
- 31
- 6
1
vote
2 answers
Segmentation Faults with boost::tuple and std::map
I have trouble with using code similar to the following one:
std::map, int> m;
boost::tuple key = boost::make_tuple(1,2,3);
m.find(key);
The compiler does not see any errors. But when I start my program a…
Bastian
- 4,638
- 6
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1
vote
1 answer
error: boost.fusion::for_each() and struct derived from boost.tuple
on compilation this code:
struct any_type: boost::tuple {
...
};
struct functor {
void operator()(const std::string& v) {
std::cout << v << std::endl;
}
};
int main() {
any_type type;
…
niXman
- 1,698
- 3
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- 40
1
vote
1 answer
no == defined for boost::tuples
I have this code:
...
#include "boost/tuple/tuple_comparison.hpp"
...
template
function memoize(const Args && ... args)
{
using noRef = boost::tuple
justHelloWorld
- 6,478
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1
vote
2 answers
How to initialize a tuple of non-default-constructible not-copyable objects?
Given some classes with parameterized constructors, such as:
class A
{
public:
A(bool b, int i) { /*...*/ }
private:
A(const A&) {}
};
class B
{
public:
B(char c, double d) { /* ... */ }
private:
B(const B&) {}
};
How to properly…
shrike
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