69 lines
1.3 KiB
Markdown
69 lines
1.3 KiB
Markdown
# nlohmann::json_pointer::pop_back
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```
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void pop_back();
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```
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Remove the last reference token.
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## Exception safety
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Strong exception safety: if an exception occurs, the original value stays intact.
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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 `pop_back`.
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```
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#include <iostream>
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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int main()
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{
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// create empty JSON Pointer
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json::json_pointer ptr("/foo/bar/baz");
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std::cout << "\"" << ptr << "\"\n";
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// call pop_back()
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ptr.pop_back();
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std::cout << "\"" << ptr << "\"\n";
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ptr.pop_back();
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std::cout << "\"" << ptr << "\"\n";
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ptr.pop_back();
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std::cout << "\"" << ptr << "\"\n";
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}
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```
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Output:
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```
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"/foo/bar/baz"
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"/foo/bar"
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"/foo"
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""
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```
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## See also
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- [`back`](https://json.nlohmann.me/api/json_pointer/back/index.md) - return last reference token
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- [`push_back`](https://json.nlohmann.me/api/json_pointer/push_back/index.md) - append an unescaped token at the end of the pointer
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- [`parent_pointer`](https://json.nlohmann.me/api/json_pointer/parent_pointer/index.md) - returns the parent of this JSON pointer
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## Version history
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Added in version 3.6.0.
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