我是新的方案拟定工作,我先是开斋。 我试图通过删除第一种和最后特性来缩短C++的座右。
在下午,我使用了[]经营者。 在C++中是否有等值?
现在我有线索。
您不能实际改变座标,只能创建std:string_view
。 页: 1
例:
std::string const str = "~Hello World~";
std::string_view const view{std::next(str.begin()), std::prev(str.end())};
但确实铭记,如果这种扼杀太短,你将面对这种打击。 这是有效的变数,因为它没有记忆分配,而且经常运行(指示很少)。
如果你绝对需要实际扼杀,可使用std:string:substr
。
std::string const str = "~Hello World~";
std::string const shorter = str.substr(1, str.size()-2);
如果这种扼杀太短,但只停留在前线,而不是背后,那也会同样糟糕。 这一变量将为非中继体分配动态记忆(because std:string
)。 通常有短暂的选择性,并且总是必须复制许多价值,因为扼杀时间很长。
You can use the substr
method of strings in C++ for this.
For example,
string S = "Hello World";
string S_sliced = S.substr(1, S.length() - 2);
S_sliced
will be the required string.
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