Discussion :

[RaphAstronome]

Bonjour,

J'aimerais faire un tableau (avec vector) de tableau de 3 doubles

Code :

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#include <vector>
using namespace std;
 
vector<double[3]> vertex;
double d[3] = {0.0, 0.0, 0.0};
vertex.push_back(d);

Seulement voila quand je compile le compilateur devient très bavard :

/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_vector.h:606: instantiated from ‘void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = double [3], _Alloc = std::allocator<double [3]>]’
/home/raphastronome/prg/tests/oulines/objet.cpp:15: instantiated from here
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/ext/new_allocator.h:104: error: ISO C++ forbids initialization in array new
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_vector.h:610: instantiated from ‘void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = double [3], _Alloc = std::allocator<double [3]>]’
/home/raphastronome/prg/tests/oulines/objet.cpp:15: instantiated from here
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/vector.tcc:256: error: cannot convert ‘const double [3]’ to ‘double [3]’ in initialization
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_vector.h:610: instantiated from ‘void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = double [3], _Alloc = std::allocator<double [3]>]’
/home/raphastronome/prg/tests/oulines/objet.cpp:15: instantiated from here
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/vector.tcc:260: error: ISO C++ forbids assignment of arrays
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_algobase.h:443: instantiated from ‘_BI2 std::__copy_backward_aux(_BI1, _BI1, _BI2) [with _BI1 = double (*)[3], _BI2 = double (*)[3]]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_algobase.h:482: instantiated from ‘static _BI2 std::__copy_backward_normal<true, true>::copy_b_n(_BI1, _BI1, _BI2) [with _BI1 = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >, _BI2 = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_algobase.h:517: instantiated from ‘_BI2 std::copy_backward(_BI1, _BI1, _BI2) [with _BI1 = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >, _BI2 = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/vector.tcc:257: instantiated from ‘void std::vector<_Tp, _Alloc>::_M_insert_aux(__gnu_cxx::__normal_iterator<typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type::pointer, std::vector<_Tp, _Alloc> >, const _Tp&) [with _Tp = double [3], _Alloc = std::allocator<double [3]>]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_vector.h:610: instantiated from ‘void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = double [3], _Alloc = std::allocator<double [3]>]’
/home/raphastronome/prg/tests/oulines/objet.cpp:15: instantiated from here
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_algobase.h:412: error: ISO C++ forbids assignment of arrays
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_uninitialized.h:86: instantiated from ‘_ForwardIterator std::__uninitialized_copy_aux(_InputIterator, _InputIterator, _ForwardIterator, __false_type) [with _InputIterator = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >, _ForwardIterator = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_uninitialized.h:113: instantiated from ‘_ForwardIterator std::uninitialized_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >, _ForwardIterator = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_uninitialized.h:254: instantiated from ‘_ForwardIterator std::__uninitialized_copy_a(_InputIterator, _InputIterator, _ForwardIterator, std::allocator<_Tp>) [with _InputIterator = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >, _ForwardIterator = __gnu_cxx::__normal_iterator<double (*)[3], std::vector<double [3], std::allocator<double [3]> > >, _Tp = double [3]]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/vector.tcc:279: instantiated from ‘void std::vector<_Tp, _Alloc>::_M_insert_aux(__gnu_cxx::__normal_iterator<typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type::pointer, std::vector<_Tp, _Alloc> >, const _Tp&) [with _Tp = double [3], _Alloc = std::allocator<double [3]>]’
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_vector.h:610: instantiated from ‘void std::vector<_Tp, _Alloc>::push_back(const _Tp&) [with _Tp = double [3], _Alloc = std::allocator<double [3]>]’
/home/raphastronome/prg/tests/oulines/objet.cpp:15: instantiated from here
/usr/lib/gcc/x86_64-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/stl_construct.h:81: error: ISO C++ forbids initialization in array new
:: === Build finished: 23 errors, 0 warnings ===

Je n'ai pas trouvé grand chose à propos des tableaux dynamiques de tableaux statiques.
J'aimerais éviter d'utiliser les pointeurs si possible.

[Laurent Gomila]

Tu ne peux pas stocker un tel tableau directement dans un conteneur. Par contre tu peux utiliser une structure qui contient un tableau.

Code :

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struct Tableau
{
    double V[3];
};
 
Tableau T = {0.f, 0.f, 0.f};
 
std::vector<Tableau> vertex;
vertex.push_back(T);

[loufoque]

Il y a un certain nombre de pré-requis pour utiliser un type avec std::vector.
En particulier, il doit être CopyConstructible et Assignable.
Ce n'est pas le cas des tableaux.