## S4 method for signature 'SoilProfileCollection'
c(x, ...)

## S4 method for signature 'SoilProfileCollection'
combine(...)

## S4 method for signature 'list'
combine(...)

# example data
spc1 <- random_profile(1, SPC = TRUE)
spc2 <- random_profile(2, SPC = TRUE)
spc3 <- random_profile('A', SPC = TRUE)

# combine into a single SPC, ... interface
spc <- combine(spc1, spc2, spc3)

# combine into a single SPC, list interface
spc <- combine(list(spc1, spc2, spc3))

# input are combined into a single SPC
spc <- c(spc1, spc2, spc3)

# result is a list when a mixture of objects are provided
spc <- c(spc1, bar=spc2, baz="foo")