我想在命名空间系统中创建一个类Console。我这样定义了这个类：
#pragma once
namespace system
{
class Console
{
public:
~Console();
void static writeLine();
private:
Console();
};
}
#include "Console.h"
#include <iostream>
system::Console::Console() {}
system::Console::~Console() {}
void system::Console::writeLine() {
std::cout << "test" << std::endl;
}
但编译器拒绝定义此类，因为系统已在stdlib.h中定义（包含在iostream中）。
我是否有一个解决方案来强制编译器＆＃34;忽略＆＃34;系统的第一个定义？
谢谢。
燕姿
答案 0 :(得分：5)
上层命名空间名称应该是合理唯一的（而不是通用的），不仅与标准库冲突，而且还与其余的库冲突。所以只需将名称空间import { Component } from '@angular/core';
import { icon,latLng, marker, polyline, tileLayer,Map, point } from 'leaflet';
/*import { GeoSearchControl, OpenStreetMapProvider } from 'leaflet-geosearch';*/
import * as L from 'leaflet';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
latlng:any
public onMapReady(map: Map) {
map.locate({setView: true, maxZoom: 16});
/*map.on('click', <LeafletMouseEvent>(e) => { alert(e.latlng.lat); alert(e.latlng.lng); });*/
var Icon = L.icon({
iconUrl: 'leaflet/marker-icon.png',
shadowUrl: 'leaflet/marker-shadow.png',
iconSize: [25,41], // size of the icon
iconAnchor: [ 13, 41 ], // point of the icon which will correspond to marker's location
shadowAnchor: [4, 62], // the same for the shadow
popupAnchor: [-3, -76] // point from which the popup should open relative to the iconAnchor
});
function onLocationFound(e) {
var radius = e.accuracy / 2;
let marker = new L.Marker(e.latlng, {
draggable: true,
icon: Icon
}).bindPopup(""+e.latlng);;
map.addLayer(marker);
this.latlng = e.latlng
}
map.on('locationfound', onLocationFound);
}
// Define our base layers so we can reference them multiple times
googleMaps = tileLayer('http://{s}.google.com/vt/lyrs=m&x={x}&y={y}&z={z}', {
maxZoom: 20,
subdomains: ['mt0', 'mt1', 'mt2', 'mt3'],
detectRetina: true
});
googleHybrid = tileLayer('http://{s}.google.com/vt/lyrs=s,h&x={x}&y={y}&z={z}', {
maxZoom: 20,
subdomains: ['mt0', 'mt1', 'mt2', 'mt3'],
detectRetina: true
});
// Marker for the top of Mt. Ranier
summit = marker([ 46.8523, -121.7603 ], {
icon: icon({
iconSize: [ 25, 41 ],
iconAnchor: [ 13, 41 ],
iconUrl: 'leaflet/marker-icon.png',
shadowUrl: 'leaflet/marker-shadow.png'
})
});
// Layers control object with our two base layers and the three overlay layers
layersControl = {
baseLayers: {
'Google Maps': this.googleMaps,
'Google Hybrid': this.googleHybrid,
},
}
/* overlays: {
'Mt. Rainier Summit': this.summit,
'Mt. Rainier Paradise Start': this.paradise,
'Mt. Rainier Climb Route': this.route
} */
// Set the initial set of displayed layers (we could also use the leafletLayers input binding for this)
options = {
layers: [this.googleMaps]
};
};放入另一个名称空间或将其重命名为
system此外，您可能希望使用某种特定于命名空间名称的前缀。例如namespace stefv::system
{
。