|
◆ operator< [1/3]
template<typename ScalarType , typename std::enable_if< std::is_scalar< ScalarType >::value, int >::type = 0>
comparison: less than Compares whether one JSON value lhs is less than another JSON value rhs according to the following rules:
- If lhs and rhs have the same type, the values are compared using the default
< operator.
- Integer and floating-point numbers are automatically converted before comparison
- In case lhs and rhs have different types, the values are ignored and the order of the types is considered, see operator<(const value_t, const value_t).
- Parameters
-
[in] | lhs | first JSON value to consider |
[in] | rhs | second JSON value to consider |
- Returns
- whether lhs is less than rhs
- Complexity
- Linear.
- Exception safety
- No-throw guarantee: this function never throws exceptions.
- Example
- The example demonstrates comparing several JSON types.
2 #include <nlohmann/json.hpp>
9 json array_1 = {1, 2, 3};
10 json array_2 = {1, 2, 4};
11 json object_1 = {{ "A", "a"}, { "B", "b"}};
12 json object_2 = {{ "B", "b"}, { "A", "a"}};
14 json number_2 = 17.0000000000001L;
15 json string_1 = "foo";
16 json string_2 = "bar";
19 std::cout << std::boolalpha;
20 std::cout << array_1 << " == " << array_2 << " " << (array_1 < array_2) << '\n';
21 std::cout << object_1 << " == " << object_2 << " " << (object_1 < object_2) << '\n';
22 std::cout << number_1 << " == " << number_2 << " " << (number_1 < number_2) << '\n';
23 std::cout << string_1 << " == " << string_2 << " " << (string_1 < string_2) << '\n';
Output (play with this example online): [1,2,3] == [1,2,4] true
{"A":"a","B":"b"} == {"A":"a","B":"b"} false
17 == 17.0000000000001 true
"foo" == "bar" false
The example code above can be translated withg++ -std=c++11 -Isingle_include doc/examples/operator__less.cpp -o operator__less
- Since
- version 1.0.0
Definition at line 20469 of file json.hpp.
|