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nlohmann
56 lines
1011 B
Markdown
56 lines
1011 B
Markdown
# nlohmann::json_pointer::back
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```
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const string_t& back() const;
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```
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Return the last reference token.
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## Return value
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Last reference token.
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## Exceptions
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Throws [out_of_range.405](https://json.nlohmann.me/home/exceptions/#jsonexceptionout_of_range405) if the JSON pointer has no parent.
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## Complexity
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Constant.
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## Examples
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Example
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The example shows the usage of `back`.
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```
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
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{
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// different JSON Pointers
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json::json_pointer ptr1("/foo");
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json::json_pointer ptr2("/foo/0");
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// call empty()
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std::cout << "last reference token of \"" << ptr1 << "\" is \"" << ptr1.back() << "\"\n"
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<< "last reference token of \"" << ptr2 << "\" is \"" << ptr2.back() << "\"" << std::endl;
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}
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```
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Output:
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```
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last reference token of "/foo" is "foo"
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last reference token of "/foo/0" is "0"
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```
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## Version history
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- Added in version 3.6.0.
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- Changed return type to `string_t` in version 3.11.0.
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