该代码在本地编译时没有问题（ubuntu 19.04，gcc-8.3.0），但是在travis构建过程中失败（ubuntu 18，gcc-8.3.0）。
错误
In file included from /usr/include/c++/7/memory:64:0,
from ./src/Game.hpp:5,
from ./src/main.cpp:3:
/usr/include/c++/7/bits/stl_construct.h: In instantiation of ‘void std::_Construct(_T1*, _Args&& ...) [with _T1 = std::unique_ptr<Cell>; _Args = {const std::unique_ptr<Cell, std::default_delete<Cell> >&}]’:
/usr/include/c++/7/bits/stl_uninitialized.h:83:18: required from ‘static _ForwardIterator std::__uninitialized_copy<_TrivialValueTypes>::__uninit_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = __gnu_cxx::__normal_iterator<const std::unique_ptr<Cell>*, std::vector<std::unique_ptr<Cell> > >; _ForwardIterator = std::unique_ptr<Cell>*; bool _TrivialValueTypes = false]’
/usr/include/c++/7/bits/stl_uninitialized.h:134:15: required from ‘_ForwardIterator std::uninitialized_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = __gnu_cxx::__normal_iterator<const std::unique_ptr<Cell>*, std::vector<std::unique_ptr<Cell> > >; _ForwardIterator = std::unique_ptr<Cell>*]’
/usr/include/c++/7/bits/stl_uninitialized.h:289:37: required from ‘_ForwardIterator std::__uninitialized_copy_a(_InputIterator, _InputIterator, _ForwardIterator, std::allocator<_Tp>&) [with _InputIterator = __gnu_cxx::__normal_iterator<const std::unique_ptr<Cell>*, std::vector<std::unique_ptr<Cell> > >; _ForwardIterator = std::unique_ptr<Cell>*; _Tp = std::unique_ptr<Cell>]’
/usr/include/c++/7/bits/stl_vector.h:331:31: required from ‘std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = std::unique_ptr<Cell>; _Alloc = std::allocator<std::unique_ptr<Cell> >]’
/usr/include/c++/7/bits/stl_construct.h:75:7: required from ‘void std::_Construct(_T1*, _Args&& ...) [with _T1 = std::vector<std::unique_ptr<Cell> >; _Args = {const std::vector<std::unique_ptr<Cell, std::default_delete<Cell> >, std::allocator<std::unique_ptr<Cell, std::default_delete<Cell> > > >&}]’
/usr/include/c++/7/bits/stl_uninitialized.h:83:18: required from ‘static _ForwardIterator std::__uninitialized_copy<_TrivialValueTypes>::__uninit_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = __gnu_cxx::__normal_iterator<const std::vector<std::unique_ptr<Cell> >*, std::vector<std::vector<std::unique_ptr<Cell> > > >; _ForwardIterator = std::vector<std::unique_ptr<Cell> >*; bool _TrivialValueTypes = false]’
/usr/include/c++/7/bits/stl_uninitialized.h:134:15: required from ‘_ForwardIterator std::uninitialized_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = __gnu_cxx::__normal_iterator<const std::vector<std::unique_ptr<Cell> >*, std::vector<std::vector<std::unique_ptr<Cell> > > >; _ForwardIterator = std::vector<std::unique_ptr<Cell> >*]’
/usr/include/c++/7/bits/stl_uninitialized.h:289:37: required from ‘_ForwardIterator std::__uninitialized_copy_a(_InputIterator, _InputIterator, _ForwardIterator, std::allocator<_Tp>&) [with _InputIterator = __gnu_cxx::__normal_iterator<const std::vector<std::unique_ptr<Cell> >*, std::vector<std::vector<std::unique_ptr<Cell> > > >; _ForwardIterator = std::vector<std::unique_ptr<Cell> >*; _Tp = std::vector<std::unique_ptr<Cell> >]’
/usr/include/c++/7/bits/stl_vector.h:331:31: required from ‘std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = std::vector<std::unique_ptr<Cell> >; _Alloc = std::allocator<std::vector<std::unique_ptr<Cell> > >]’
./src/Systems/Physics/Grid.hpp:9:7: required from here
/usr/include/c++/7/bits/stl_construct.h:75:7: error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = Cell; _Dp = std::default_delete<Cell>]’
{ ::new(static_cast<void*>(__p)) _T1(std::forward<_Args>(__args)...); }
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/memory:80:0,
from ./src/Game.hpp:5,
from ./src/main.cpp:3:
/usr/include/c++/7/bits/unique_ptr.h:388:7: note: declared here
unique_ptr(const unique_ptr&) = delete;
构造unique_ptr<Cell>的唯一地方是这里
Grid::Grid(float gridLength, float halfWidth) : \
gridLength(gridLength),
cellsInRow(ceilf(gridLength / (2 * halfWidth))),
halfWidth(halfWidth),
collisionDetector()
{
this->cells.resize(this->cellsInRow);
// cell insertion
for (int row = 0; row < this->cells.size() ; row++)
{
this->cells[row].reserve(this->cellsInRow);
for (int col = 0; col < this->cellsInRow; col++)
{
float x = col * 2 * halfWidth + halfWidth;
float z = row * 2 * halfWidth + halfWidth;
this->cells[row].push_back(std::make_unique<Cell>(glm::vec3(x, 0.f, z), halfWidth, row, col));
}
}
}
这段代码中的某处似乎调用了unique_ptr的副本构造函数，但我不知道在哪里。
编辑：
Grid.hpp
#pragma once
#include <memory>
#include <vector>
#include "Cell.hpp"
#include "Collider.hpp"
#include "CollisionDetector.hpp"
class Grid
{
public:
/**
Divides the 3d space into a 2d grid
*/
Grid(float gridLength, float halfWidth);
/**
Insert a Collider collider
*/
void Insert(std::shared_ptr<Collider> object);
/**
Deletes an object from the grid.
*/
void Remove(std::shared_ptr<Collider> object);
/**
Performs a collision check on all the cells and generates contact data.
*/
std::vector<std::shared_ptr<Collision>> CheckCollisions();
std::vector<std::shared_ptr<Collision>> CheckCells(int rowA, int colA, int rowB, int colB);
// ===============
// Utility methods
// ===============
/**
Returns a vector of pairs denoting the cells to be checked for collision detection
*/
std::vector<std::pair<int, int>> GetEligibleCells(int cellRow, int cellCol);
/**
GetInsertRow returns the row of the cell that the object needs to get inserted into
*/
int GetInsertRow(glm::vec3 point);
/**
GetInsertCol returns the column of the cell where the object should be inserted.
*/
int GetInsertCol(glm::vec3 point);
const std::vector< std::vector< std::unique_ptr<Cell>>>& GetCells();
private:
int cellsInRow;
float halfWidth;
float gridLength;
CollisionDetector collisionDetector;
std::vector< std::vector< std::unique_ptr<Cell> > > cells;
};
网格仅由PhysicsSystem
PhysicsSystem::PhysicsSystem(float gridLength, float cellHalfWidth) : grid(gridLength, cellHalfWidth)
{
this->primaryBitset = ComponentType::Physics | ComponentType::Transform;
}
物理系统仅在此处初始化
Game::Game(int width, int height) :
width(width), height(height) ,
physicsSystem(70.f, 5.f)
{
// stuff
}