Overview

tuple provides a set of utilities for working with C++11 standard tuples, backporting some of the features from C++14 to ensure compatibility with earlier versions of the language. It includes various helper functions and templates.

Usage

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Constraints	The estd::get function relies on unique types within the tuple. If a tuple contains multiple elements of the same type, only the first occurrence will be accessed correctly.	The for_each function requires the function f passed to it to be compatible with all elements of the tuple.
Usage Guidance	Ensure that the types within the tuple are unique when using estd::get to avoid ambiguity.\|br\|	When using for_each, the function f` should be able to accept all types in the tuple as arguments. For example, if the tuple contains both int and std::string, f should be able to process both types.

Example

The following example demonstrates retrieving tuple elements.

TEST(tuple, get)
{
    auto const t = std::make_tuple(uint8_t(5), uint16_t(9));

    EXPECT_EQ(5U, ::estd::get<uint8_t>(t));
    EXPECT_EQ(9U, ::estd::get<uint16_t>(t));
}

This example shows applying a function to each tuple element.

TEST(tuple, for_each)
{
    auto const t = std::make_tuple(uint8_t(5), uint16_t(10));
    SumUp sum;
    ::estd::for_each(t, sum);
    EXPECT_EQ(15U, sum.value);
}