[英]Why the following code compiles with `c++03` but not with `c++11`
[英]Convert small bit of code from c++11 to c++03?
我是一名社會科學家,試圖編譯C ++代碼,並且遇到了一些小問題,如果您知道C ++的話,我認為它很容易修復,但對我來說卻是難以理解的。
試圖在V2008上進行編譯,但是我的代碼似乎使用了一些C ++ 11語法技巧。
原則上,我認為這是解決方案 ,但是我真的不了解C ++,因此不確定如何實現。
代碼塊:
Optimiser::Optimiser(double eps, double delta, unsigned long max_itr, long random_order)
{
this->eps = eps;
this->delta = delta;
this->max_itr = max_itr;
this->random_order = random_order;
}
Optimiser::Optimiser() : Optimiser::Optimiser(1e-5, 1e-2, 1000, 1)
{
//ctor
}
我得到的錯誤(指的是Optimiser :: Optimiser():Optimiser :: Optimiser(1e-5,1e-2,1000,1)行)是:
c:\Program Files (x86)\Common Files\Microsoft\Visual C++ for Python\9.0\VC\Include\xlocale(342) : warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify /EHsc
src\Optimiser.cpp(39) : error C2039: '{ctor}' : is not a member of 'Optimiser' include\Optimiser.h(26) : see declaration of 'Optimiser'
src\Optimiser.cpp(40) : error C2614: 'Optimiser' : illegal member initialization: 'Optimiser' is not a base or member
error: command '"c:\Program Files (x86)\Common Files\Microsoft\Visual C++ for Python\9.0\VC\Bin\amd64\cl.exe"' failed with exit status 2
直到C ++ 11才允許委托構造函數。 話雖如此,您將復制代碼,但是您只需將第二個構造函數更改為
Optimiser::Optimiser()
{
eps = 1.0e-5;
delta = 1.0e-2;
max_itr = 1000UL;
random_order = 1L;
//rest of your ctor
}
可能最直接的解決方案是刪除當前的默認構造函數,並在另一個中提供默認參數
class Optimiser {
public:
Optimiser(double eps = 1e-5, double delta = 1e-2, unsigned long max_itr = 1000, long random_order = 1);
...
}
盡管最好使用初始化列表,但構造器定義可以保持原樣
Optimiser::Optimiser(double p_eps, double p_delta, unsigned long p_max_itr, long p_random_order):
eps(p_eps),
delta(p_delta),
max_itr(p_max_itr),
random_order(p_random_order)
{
}
我建議更改此:
Optimiser::Optimiser() : Optimiser::Optimiser(1e-5, 1e-2, 1000, 1)
{
//ctor
}
對此:
Optimizer::Optimizer()
: eps(1.0e-5), delta(1.0e-2), max_itr(1000), random_order(1)
{
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.