今天試一個程式。裡面使用了
Code
#include <ctime> // definitions of time_t, time, localtime and asctime
using std::time_t;
using std::time;
using std::localtime;
using std::asctime;
結果VC6報錯
Code
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 80x86
Copyright (C) Microsoft Corp 1984-1998. All rights reserved.
localtime.cpp
localtime.cpp(7) : error C2039: 'time_t' : is not a member of 'std'
localtime.cpp(7) : error C2868: 'time_t' : illegal syntax for using-declaration; expected qualified-name
localtime.cpp(8) : error C2039: 'time' : is not a member of 'std'
localtime.cpp(8) : error C2873: 'time' : symbol cannot be used in a using-declaration
localtime.cpp(9) : error C2039: 'localtime' : is not a member of 'std'
localtime.cpp(9) : error C2873: 'localtime' : symbol cannot be used in a using-declaration
localtime.cpp(10) : error C2039: 'asctime' : is not a member of 'std'
localtime.cpp(10) : error C2873: 'asctime' : symbol cannot be used in a using-declaration
Process completed, Exit Code 2.
Execution time: 00:02.273
然後把關於時間的標準庫給改了。直接用
Code
#include <time.h>
就OK了。
實際上很多C++的std如果出現上面的問題,都是這個原因。