Boost.Any is a C++ library that offers a safe, generic container for single values of different value types.
Boost.Any is a C++ library that offers a safe, generic container for single values of different value types.
Questions tagged [boost-any]
118 questions
0
votes
2 answers
Boost::any not empty when used from a pointer
I have the following test application:
#include
#include
void check(boost::any y)
{
if (y.empty())
std::cout << "empty!\n";
else
std::cout << "Not empty, type: " << y.type().name() << "\n";
}
int…
Veda
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0
votes
1 answer
boost::any with structs and unsigned ints
There are several parts to my question. I have been researching on how/when to use boost::any. I was wondering if it is possible to assign a struct to a boost::any variable.
Example:
struct S {
int x;
};
S s;
s.x = 5;
boost::any var = s;
It…
demogorgon
- 474
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0
votes
1 answer
boost::unsafe_any_cast invalid non-null pointer when empty?
I've got a piece of code in which I use boost::unsafe_any_cast(&boost::any anyInstance) to obtain the content pointer of a boost::any object.
The code is this below:
boost::any staticResult; //contains a private pointer called…
XectX
- 36
- 4
0
votes
0 answers
Different behaviour if type is a reference
I'm using the function tryValue very often in my projects. It is simple wrapper around boost::any, that simplifies greatly its everyday usage.
#include
#include
#include
#include…
Aleph0
- 5,816
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0
votes
1 answer
Using Eigen::LLT within a templated function
I have written the following function:
template
inline static boost::any ApplyCholesky(boost::any const& A, boost::any const& x) {
const Eigen::LLT& chol = boost::any_cast…
ad_ad
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0
votes
1 answer
Why does this type erasure implementation (simplified boost:any) gives segmentation fault?
I was trying my own implementation of a generic container of arbitrary type (similar to boost:any) just to learn about the idiom, and I am trying to understand why my code gives a segmentation fault.
class IValue
{
public:
IValue() = default;
…
bone
- 144
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0
votes
1 answer
Type checking of std::map of keys and/or values of type boost::any?
I am writing helper functions which converts DBus properties values to std types. For that, to convert few type, i need to create a std::map. The map will represent DICT type in DBus. The DICT type in DBUS can have any type as a key and any type as…
abhiarora
- 9,743
- 5
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0
votes
1 answer
Heterogeneous HashMap c++
I have different data types which I'm trying to save in one HashMap.
The HashMap will be created inside a variable arguments function.
Unions under struct and Boost::Any didn't work for me,
Unions don't accept classes as data types.
Boost::any gives…
sudhansh_
- 125
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- 14
0
votes
0 answers
Comparator for boost::any underlying type
I have a struct that is used for Tokenizing a byte stream (std::vector). The stream can contain bytes, words, dwords, null-terminated strings and raw data.
struct Token {
enum TokenClass {
BYTE, WORD, INT, SZCHAR, DATA
…
graham.reeds
- 16,230
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0
votes
1 answer
C++: How to create a vector storing vectors of any type?
I'd like to store vectors of any type in another vector. So, for example I have two vector instances, "std::vector v1" and "std::vector v2". And I would like to put them into a vector. I already tried like this:
std::vector…
Maahly
- 15
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0
votes
2 answers
std::unordered_map throws annoying compile errors
When I declare a variable of std::unordered_map type, it throws annoying compile errors.
For an example, any.cc:
#include
signal
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0
votes
3 answers
boost::any confusion with pointers vs values
It took me a while to figure this out, but the semantics of boost::any are confusing.
With value types, you use it like so:
int value = 100;
boost::any something;
something = value;
//...later...
int value = boost::any_cast(&something);
This…
void.pointer
- 24,859
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0
votes
0 answers
Trying to use boost::serialization of Boost::any
I am trying to work with boost::serialisation for saving and loading some objects.
So far from the boost::tutorial I have managed to do things work for all the different stl stuff (vectors, pairs, lists etc), for derived classes, for boost…
user3111197
- 83
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- 11
0
votes
1 answer
Overload operator == for STL container
I'm trying to remove a class object from list l
l.remove(class_type);
I tried writing something like this as a member function
bool operator == (const class_type &a) const //not sure about the arguments
{
//return bool value
}
How…
cpx
- 17,009
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0
votes
3 answers
casting pointers
I'm using ptr_map for storing different types of pointers.
boost::ptr_map someMap;
I store there some templated class objects:
someMap.insert("1", new SomeClass());
someMap.insert("2", new SomeClass());
Now I want to get…
Max Frai
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