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shared_ptr<set<size_type>> 值初始化为什么是空指针 #92

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z974890869 opened this issue Sep 4, 2020 · 0 comments
Open

shared_ptr<set<size_type>> 值初始化为什么是空指针 #92

z974890869 opened this issue Sep 4, 2020 · 0 comments

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@z974890869
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在书中 TextQuery构造函数（建立单词与行号）中
auto &lines = wm[word]; //shared_ptr<set<size_typr>> wm if(!lines) line.reset(new set<size_type>);
我知道shared_ptr默认初始化是空指针
为什么：当word不在map中则对word关联的值进行值初始化,则lines将是空指针

word关联的值是 shared_ptr<set<size_typr>>类型值初始化为什么不带有类型呢
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