我尝试编译此代码片段,但出现编译器错误:(!使用 Visual Studio 2010 进行编译
#include <vector>
#include <string>
#include <sstream>
#include <iterator>
#include <iostream>
using namespace std;
int main() {
string s( "Well well on" );
istringstream in( s );
vector<string> v( istream_iterator<string>( in ), istream_iterator<string>() );
copy( v.begin(), v.end(), ostream_iterator<string>( cout, "\n" ) );
}
Errors:
Error 1 error C2228: left of '.begin' must have class/struct/union c:\visual studio 2008 projects\vector test\vector test\main.cpp 13 vector test
Error 2 error C2228: left of '.end' must have class/struct/union c:\visual studio 2008 projects\vector test\vector test\main.cpp 13 vector test
发生了什么?向量构造正确,我怎么无法调用它?
此致,
我认为这
vector<string> v( istream_iterator<string>( in ), istream_iterator<string>() );
被解析为函数声明:
vector<string> v( istream_iterator<string> in, istream_iterator<string> );
这通常被称为“C++最令人烦恼的解析” https://stackoverflow.com/questions/4283576/constructor-invocation-mechanism.
我认为一些额外的括号可以解决这个问题:
vector<string> v( (istream_iterator<string>(in)), (istream_iterator<string>()) );
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