Create and Delete
Let's start things off by learning how to create and destroy strings.
C++ offers many methods to create strings from C or C++ strings. Under the hood, there is always a C string involved for creating a C++ string. That changes with C++14, because the new C++ standard support C++ string literals: std::string str{"string"s}
. The C string literals "string literal"
becomes with the suffix s
a C++ string literal: "string literal"s
.
The table gives you an overview of the methods to create and delete a C++string.
Methods | Example |
---|---|
Default | std::string str |
Copies from a C++ string | std::string str(oth) |
Moves from a C++ string | std::string str(std::move(oth)) |
From the range of a C++ string | std::string(oth.begin(), oth.end()) |
From a substring of a C++ string | std::string(oth, otherIndex) |
From a substring of a C++ string | std::string(oth, otherIndex, strlen) |
From a C string | std::string str("c-string") |
From a C array | std::string str("c-array", len) |
From characters | std::string str(num, 'c') |
From a initializer list | std::string str({'a', 'b', 'c', 'd'}) |
From a substring | str= other.substring(3, 10) |
Destructor | str.~string() |
Methods to create and delete a string
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