JSON for Modern C++ 2.1.1
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◆ back() [1/2]

template<template< typename U, typename V, typename... Args > class ObjectType = std::map, template< typename U, typename... Args > 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 U > class AllocatorType = std::allocator, template< typename T, typename SFINAE=void > class JSONSerializer = adl_serializer>
reference nlohmann::basic_json< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >::back ( )
inline

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;
iterator end() noexcept
returns an iterator to one past the last element
Definition json.hpp:4741
static basic_json array(std::initializer_list< basic_json > init=std::initializer_list< basic_json >())
explicitly create an array from an initializer list
Definition json.hpp:2165
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\n 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
std::out_of_rangewhen called on null value.
Example\n The following code shows an example for back(). \n @includelineno back.cpp \n Output (play with this example @htmlinclude back.link):\n @verbinclude back.output \n The example code above can be translated with @verbatim g++ -std=c++11 -Isrc doc/examples/back.cpp -o back @endverbatim
See also
front() – access the first element
Since
version 1.0.0

Definition at line 4235 of file json.hpp.