AnyMap Class Reference

A map of string keys to values whose type can vary at runtime. More...

#include <AnyMap.h>

Public Member Functions
AnyValue &	operator[] (const std::string &key)
AnyValue &	at (const std::string &key)
bool	hasKey (const std::string &key) const

Private Attributes
std::unordered_map< std::string, AnyValue >	m_data

Friends
class	AnyValue

Detailed Description

A map of string keys to values whose type can vary at runtime.

Values in an AnyMap are held by instances of AnyValue. Instances of AnyMap can be nested to form a tree.

Setting elements

AnyMap breakfast;
breakfast["spam"] = 123.4; // Creates a value of type 'double'
breakfast["eggs"] = "scrambled"; // Creates a value of type 'std::string'

// Create a nested AnyMap named "beans" which has a key named "baked"
// whose value is a vector<double>
std::vector<double> v{3.14, 1.59, 2.65};
breakfast["beans/baked"] = v;
// Equivalently:
breakfast["beans"]["baked"] = v;

// Create a nested AnyMap with values of the same type
std::map<std::string, double> breads{{"wheat", 4.0}, {"white", 2.5}};
breakfast["toast"] = breads;
// Equivalent to:
breakfast["toast"]["wheat"] = 4.0
breakfast["toast"]["white"] = 2.5

Accessing elements

double val1 = breakfast["spam"].asDouble();
std::string val2 = breakfast["eggs"].asString();
vector_fp val3 = breakfast["beans"]["baked"].asVector<double>();

std::map<std::string, double> = breakfast["toast"].asMap<double>();

Checking for elements

try {
    breakfast["waffle"].asDouble();
} except (std::exception& err) {
    // Exception will be thrown.
    // 'breakfast' will have an empty key named "waffle"
}

try {
    breakfast.at("grits").asDouble();
} except (std::exception& err) {
    // Exception will be thrown and no new key will be added
}

if (breakfast.hasKey("grits")) {
    // do something with this entry
}

Checking element types

if (breakfast["sausage"].is<vector<double>>()) {
    // access using asVector<double>
} else if (breakfast["sausage"].type() == typeid(vector<std::string>)) {
    // access using asVector<std::string>
}

Definition at line 173 of file AnyMap.h.

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The documentation for this class was generated from the following files:

• AnyMap.h
• AnyMap.cpp