为什么这段代码在尝试将var columnDefsNew = [
{ headerName: "", field: "column0", width: 300, },
{ headerName: "", field: "column1", width: 100 },
{ headerName: "", field: "column2", width: 100 },
{ headerName: "", field: "column3", width: 100 },
{ headerName: "", field: "column4", width: 100 },
{ headerName: "", field: "column5", width: 100, }];
class Home extends Component {
constructor(props) {
super(props);
this.state = {
columnDefs: [
{ headerName: "", field: "column0", width: 300 },
{ headerName: "", field: "column1", width: 100 },
{ headerName: "", field: "column2", width: 100 },
{ headerName: "", field: "column3", width: 100 },
{ headerName: "", field: "column4", width: 100 },
{ headerName: "", field: "column5", width: 100 }],
rowData: null,
isLoading: false,
error: null
};
}
componentDidMount() {
this.setState({ isLoading: true });
axios.get(API + PARMS)
.then(fubar => {
const headerRow = fubar.data.header;
const rowData = fubar.data.results;
this.setState({ rowData });
columnDefsNew[0].headerName = headerRow.column0;
columnDefsNew[1].headerName = headerRow.column1;
columnDefsNew[2].headerName = headerRow.column2;
columnDefsNew[3].headerName = headerRow.column3;
columnDefsNew[4].headerName = headerRow.column4;
columnDefsNew[5].headerName = headerRow.column5;
this.setState({ columnDefs: columnDefsNew });
})
.catch(error => this.setState({
error,
isLoading: false
}));
}
render() {
const { isLoading, rowData, columnDefs } = this.state;
return (
<div className="ag-theme-balham" style={{ height: '525px', width: '900px' }} >
<h2>{heading}</h2>
<AgGridReact
columnDefs={columnDefs}
rowData={rowData}>
</AgGridReact>
</div>
);
}
}
export default Home;
构造的字符串转换为常规的默认构造字符串时会产生错误？
std::istreambuf_iterator<char>编辑：：添加了错误消息。
#include <string>
#include <streambuf>
int main()
{
std::string filePath = "path";
std::string source(
std::istreambuf_iterator<char>(
std::ifstream( filePath ) ),
std::istreambuf_iterator<char>() );
std::string s2 = source;
}