[英]Binding a std::function to a member function in c++?
I'm working with Open3D library using the following function :我正在使用以下函数使用 Open3D 库:
bool open3d::visualization::DrawGeometriesWithAnimationCallback
(
const std::vector< std::shared_ptr< const geometry::Geometry >> & geometry_ptrs,
std::function< bool(Visualizer *)> callback_func,
const std::string & window_name = "Open3D",
int width = 640,
int height = 480,
int left = 50,
int top = 50
)
I have managed to get it working, if I call this function from my main and having the function in the same main.cpp
file.如果我从 main 调用此函数并将该函数放在同一个main.cpp
文件中,我已经设法让它正常工作。 However, I would like to point to a class member function instead.但是,我想改为指向类成员函数。 This is what I got so far:这是我到目前为止得到的:
#include "WorkDispatcher.h"
int main(int argc, char* argv[])
{
// setup of the needed classes I want to point to
WorkDispatcher dispatcher;
dispatcher.Initialize();
dispatcher.m_MeshHandler.m_Mesh = open3d::geometry::TriangleMesh::CreateBox();
dispatcher.Work();
// here is the described issue
std::function<bool(open3d::visualization::Visualizer*)> f = std::bind(&MeshHandler::UpdateMesh, dispatcher.m_MeshHandler);
open3d::visualization::DrawGeometriesWithAnimationCallback({ dispatcher.m_MeshHandler.m_Mesh }, f, "Edit Mesh", 1600, 900);
dispatcher.Stop();
return 0;
}
This is derived from this post , but gives me the following error:这是从this post派生的,但给了我以下错误:
no suitable user-defined conversion from "std::_Binder<std::_Unforced, bool (MeshHandler::*)(open3d::visualization::Visualizer *vis), MeshHandler &>" to "std::function<bool (open3d::visualization::Visualizer *)>" exists没有合适的用户定义转换从“std::_Binder<std::_Unforced, bool (MeshHandler::*)(open3d::visualization::Visualizer *vis), MeshHandler &>”到“std::function<bool ( open3d::visualization::Visualizer *)>" 存在
I'm not quite sure how to resolve this issue.我不太确定如何解决这个问题。 Within the MeshHandler::UpdateMesh()
function I would like to access other members of the class instance.在MeshHandler::UpdateMesh()
函数中,我想访问类实例的其他成员。
Turns out you need to use std::placeholders
in your std::bind
function.原来你需要在std::bind
函数中使用std::placeholders
。 The following code works:以下代码有效:
std::function<bool(open3d::visualization::Visualizer*)> f = std::bind(&MeshHandler::UpdateMesh, dispatcher.m_MeshHandler, std::placeholders::_1);
open3d::visualization::DrawGeometriesWithAnimationCallback({ dispatcher.m_MeshHandler.m_Mesh }, f, "Edit Mesh", 1600, 900);
Seestd::bind
documentation for further information.有关更多信息,请参阅std::bind
文档。
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