template<template< typename, typename, typename... > class ObjectType = std::map, template< typename, typename... > class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template< typename > class AllocatorType = std::allocator, template< typename, typename=void > class JSONSerializer = adl_serializer>
Returns a reference to the last element in the container. For a JSON container c
, the expression c.back()
is equivalent to
auto tmp = c.end();
--tmp;
return *tmp;
- Returns
- In case of a structured type (array or object), a reference to the last element is returned. In case of number, string, or boolean values, a reference to the value is returned.
- Complexity Constant.
- Precondition
- The JSON value must not be
null
(would throw std::out_of_range
) or an empty array or object (undefined behavior, guarded by assertions).
- Postcondition
- The JSON value remains unchanged.
- Exceptions
-
invalid_iterator.214 | when called on a null value. See example below. |
- Example The following code shows an example for back(). back.cpp Output (play with this example back.link): back.output The example code above can be translated withg++ -std=c++11 -Isrc doc/examples/back.cpp -o back
- See also
- front() – access the first element
- Since
- version 1.0.0
Definition at line 10651 of file json.hpp.