C++ Stringstream 初始化
C++ Stringstream initializations
我有两个代码片段：
这不编译：
std::string reverseSentence(std::string sentence) {
std::stringstream stream = sentence;
}
这样做：
std::stringstream stream (sentence);
我的理解是 T foo = expr 是 T foo(expr)。因此，这两个 stringstream 初始化不是等价的吗？为什么一个编译，另一个不编译？
constructor of std::basic_stringstream taking std::string is marked as explicit, it's not considered in copy initalization喜欢std::stringstream stream = sentence;。
std::stringstream stream (sentence); 是 direct initialization，它也考虑了 explicit 构造函数。
Direct-initialization is more permissive than copy-initialization: copy-initialization only considers non-explicit constructors and non-explicit user-defined conversion functions, while direct-initialization considers all constructors and all user-defined conversion functions.
我有两个代码片段：
这不编译：
std::string reverseSentence(std::string sentence) {
std::stringstream stream = sentence;
}
这样做：
std::stringstream stream (sentence);
我的理解是 T foo = expr 是 T foo(expr)。因此，这两个 stringstream 初始化不是等价的吗？为什么一个编译，另一个不编译？
constructor of std::basic_stringstream taking std::string is marked as explicit, it's not considered in copy initalization喜欢std::stringstream stream = sentence;。
std::stringstream stream (sentence); 是 direct initialization，它也考虑了 explicit 构造函数。
Direct-initialization is more permissive than copy-initialization: copy-initialization only considers non-explicit constructors and non-explicit user-defined conversion functions, while direct-initialization considers all constructors and all user-defined conversion functions.