JSON for Modern C++ 3.0

- Main Page
- Related Pages
- Modules
- Classes

allocator_type
array
array_t
at
at
at
at
back
back
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
basic_json
begin
begin
boolean_t
cbegin
cend
clear
const_pointer
const_reference
count
crbegin
crend
difference_type
dump
empty
end
end
erase
erase
erase
erase
find
find
front
front
get
get
get_allocator
get_ptr
is_array
is_boolean
is_discarded
is_null
is_number
is_number_float
is_number_integer
is_object
is_primitive
is_string
is_structured
list_init_t
max_size
number_float_t
number_integer_t
object
object_t
operator value_t
operator ValueType
operator!=
operator+=
operator+=
operator+=
operator<
operator<
operator<<
operator<<
operator<=
operator=
operator==
operator>
operator>=
operator>>
operator>>
operator[]
operator[]
operator[]
operator[]
operator[]
operator[]
parse
parse
parse_event_t
parser_callback_t
pointer
push_back
push_back
push_back
rbegin
rbegin
reference
rend
rend
size
size_type
string_t
swap
swap
swap
swap
type
value_t
value_type
~basic_json
| 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 = int64_t, class NumberFloatType = double, template< typename U > class AllocatorType = std::allocator>
bool nlohmann::basic_json::is_string | ( |  | ) | const
| inline noexcept
  This function returns true iff the JSON value is a string. Returns `true` if type is string, `false` otherwise. Complexity Constant. Example The following code exemplifies is_string for all JSON types. 1 #include <json.hpp> 2 3 using namespace nlohmann; 4 5 int main() 6 { 7 // create JSON values 8 json j_null; 9 json j_boolean = true; 10 json j_number_integer = 17; 11 json j_number_float = 23.42; 12 json j_object = {{"one", 1}, {"two", 2}}; 13 json j_array = {1, 2, 4, 8, 16}; 14 json j_string = "Hello, world"; 15 16 // call is_string() 17 std::cout << std::boolalpha; 18 std::cout << j_null.is_string() << '\n'; 19 std::cout << j_boolean.is_string() << '\n'; 20 std::cout << j_number_integer.is_string() << '\n'; 21 std::cout << j_number_float.is_string() << '\n'; 22 std::cout << j_object.is_string() << '\n'; 23 std::cout << j_array.is_string() << '\n'; 24 std::cout << j_string.is_string() << '\n'; 25 } nlohmann::basic_json a class to store JSON values Definition: json.hpp:124 nlohmann::basic_json::is_string bool is_string() const noexcept return whether value is a string Definition: json.hpp:1623 nlohmann namespace for Niels Lohmann Definition: json.hpp:59 Output:
      false
      false
      false
      false
      false
      false
      true
  The example code above can be translated with
      g++ -std=c++11 -Isrc doc/examples/is_string.cpp -o is_string
.